The Big Bang Theory Wiki
Advertisement

Timeline of events that happened on The Big Bang Theory.

Season 1[]

This chronology is a timeline of events that occurred during the first season or approximately September 2007 to May 2008.

1. “Pilot

August, 2007 to August, 2008  a box at UPS falls on Eric's head [The Locomotive Manipulation]

September 24, 2007 Penny moves in and meets Sheldon and Leonard, for whom it is love at first sight. Sheldon & Leonard fail to get Penny's TV from Kurt, her ex-boyfriend.

 2. “The Big Bran Hypothesis

September 25, 2007 Penny asks Leonard to sign for some furniture she's having delivered

September 26, 2007 The furniture arrives.  Leonard and Sheldon get it upstairs with       difficulty, due to the non-functional elevator. Sheldon is so upset  by Penny's messy apartment that he returns later that night to tidy up 

September 27, 2007  Penny discovers the boys were in her apartment while she was      asleep and is furious, but she does later forgive them

September 28, 2007   Leonard, Sheldon, Raj and Howard try to assemble Penny's     furniture

3. “The Fuzzy Boots Corollary”

September 29, 2007  When Leonard sees Penny kissing Doug, he is devastated.

October 1, 2007 Leonard asks out Leslie Winkle, who says no

October 2, 2007  Leonard and Penny go on a  “date” 

4. “The Luminous Fish  Effect”

October 3, 2007 At a party to welcome Dr. Gablehouser, the new head of the Cal        Tech physics department, Sheldon is fired

October 4, 2007 Sheldon and Penny go to the grocery store

October 21, 2007  Sheldon's mom arrives

October 22, 2007 Sheldon apologizes to Dr. Gablehouser and is rehired (morning)

5. “The Hamburger Postulate”

October 22, 2007 Leslie Winkle approaches the group at the Cheesecake Factory  (nite)

Tuesday, October 23, 2007, Leonard & Leslie play in string quartet, then hook up

October 24, 2007 Leslie dumps Leonard

October 25, 2007 Sheldon & Leonard eat at the Cheesecake factory

6. “The Middle Earth Paradigm” 

October 26, 2007 after losing at paintball the boys are invited to Penny's  Halloween party

Saturday October 27, 2007  at Penny's Halloween party Kurt shows up. Penny kisses Leonard

7. “The Dumpling Paradox” 

Friday November 2, 2007 Penny's friend Christy arrives on Halo Night and launches into a sexual relationship with Howard  

Saturday November 3, 2007 – Christy moves in with Howard

November 6, 2007 Sheldon, Leonard & Raj eat at Szechwan Palace

Wednesday, November 7, 2007, on Halo night Christy leaves

8. “The Grasshopper Experiment”

November 8, 2007 Raj's parents tell him about Lalita Gupta

November 9, 2007 A date set up between Raj & Lalita. Raj learns he can talk to girls     if he is drunk

Saturday November 10,  2007 Raj & Lalita's date, she leaves with Sheldon

November 11, 2007 Sheldon sings at the Cheesecake Factory  

9. “The Cooper-Hofstadter Polarization”

March 17, 2008 Leonard learns he's been invited to speak about supersolids at Bose-   Einstein Condensates conference

March 18, 2008 Penny selects Leonard's wardrobe

March 18, 2008 Penny forwards to  Sheldon a LOL Cat e-mail [the Panty Piñata Polarization]

March 19, 2008 Leonard gives speech, but Sheldon shows up

March 20, 2008  Howard controls some lights in China

10. “The Loobenfeld Decay”

March 24, 2008  Sheldon and Leonard are invited to see Penny in “Rent”

March 25, 2008 Sheldon fabricates an elaborate lie why they can't go

Friday March 28, 2008 “Rent”  is performed

March 29, 2008  Sheldon worries the lie might not hold up

March 30, 2008 “Leo” shows up for his “intervention”

11. “The Pancake Batter Anomaly”    

March 31, 2008 Penny returns from a trip to Nebraska

Sunday April 6, 2008 Sheldon is sick  

April, 2008 Penny last has sex for six months [The Barbarian Sublimation]

12. “The Jerusalem Duality”

April 14, 2008 the boys meet Dennis Kim

April 15, 2008 Sheldon visits Howard and Raj to find a new job

April 16, 2008 at the reception Dennis shows up with a girl

April 17, 2008 the boys see Dennis in the park with the girl

13. “The Bat-Jar Conjecture”

April 21, 2008  the boys decide to enter the physics bowl

Saturday April 26, 2008 they discuss team names, but after a practice round Sheldon  is kicked off the team

April 28, 2008 Leonard, Raj and Howard draft Leslie Winkle for their team

April 29, 2008 The physics bowl, Sheldon loses

April 30, 2008 Leonard taunts Sheldon about his loss

14. “The Nerdvana Annihilation”

May 2, 2008 Leonard buys a time machine 

May 3, 2008 the time machine arrives. Penny is late for work and blames the boys playing with toys. 

May 4, 2008 Leonard wants to get rid of all his collectibles

May 7, 2008 Sheldon tells Leonard he has an eidetic memory [The Creepy Candy Coating Corollary]

15. “The Pork Chop Indeterminacy”

May 8, 2008 Missy Cooper arrives and all the boys try to hit on her, but none succeed

May 9, 2008 Missy leaves for Texas

16. “The Peanut Reaction”

May 12, 2008 the gang discuss birthdays

My 13, 2008 Penny blackmails Sheldon into having a birthday party for Leonard

May 17, 2008 Leonard's birthday party that he misses

17. “The Tangerine Factor”

May 19, 2008 Leonard asks Penny out on a date 

May 24, 2008 both Leonard and Penny talk to Sheldon then leave on their date

Season 2[]

Timeline

This chronology is a timeline of events that happened during the Second Season or approximately May 2008 to May 2009

18. “The Bad Fish Paradigm

May 24, 2008 Leonard & Penny return from their date

May 31, 2008   Penny confesses to Sheldon that she did not graduate, he  freaks out    about keeping a secret and moves out                         

June 1, 2008 Penny dumps Leonard

September, 2008 Penny's check engine light comes on [The Euclid Alternative]

19. “The Codpiece Topology”

September 21, 2008 - the boys attend the renaissance fair

September 25, 2008 – Leonard makes a date with Leslie Winkle

Friday, September 26, 2008  – Leonard's date with Leslie

September 27, 2008 – Leonard & Leslie's second date & break up

September 28, 2008 – the boys attend the renaissance fair

20. “The Barbarian Sublimation”

October 5, 2008 – Sheldon introduces Penny to Age of Conan

October 6, 2008  – Penny comes in Sheldon's room

Thursday, October 9, 2008  – Penny calls Sheldon @ work

October 10, 2008 – Sheldon tries to set-up Penny with a guy

October 11, 2008  – Tom shows up, Penny overcomes her addiction

21. “The Griffin Equivalency”

October 13, 2008 – Raj learns about People's 30 under 30 article

October 14, 2008  – Dr. Gablehouser fawns over Raj

Saturday, October 18, 2008 – Raj takes Penny to the People magazine reception

October 19, 2008 – Raj apologizes to Penny

22. “The Euclid Alternative”

October 20, 2008 – Penny drives Sheldon to work

October 21, 2008 – intervention and a visit to the DMV

October 22, 2008  – Sheldon on the driving simulator

October 23, 2008 – Sheldon lives at Cal Tech

23. “The Cooper-Nowitzki Theorem”

October 26, 2008 – Leonard & Sheldon lecture to undergrads

Monday, October 27, 2008 – Ramona shows up

Wednesday October 29, 2009 -  Ramona get Sheldon's food & gives pedicure

Saturday, November 1, 2008 – Sheldon does not leave to play paintball, but later tries to sneak off

                                            

November 2, 2008 - Sheldon caught by Ramona with a batman comic

November 3, 2008 everyone except Sheldon plays paintball

November 4, 2008 – Ramona finds Sheldon in shower with a gameboy, Sheldon seeks sanctuary with Penny

November 5, 2008  – Sheldon's breakthrough; Ramona leaves

November 6, 2008 – Sheldon meets  Kathy O’Brien, another grad student

24. “The Panty Piñata Polarization”

November 10, 2008 – Howard & Raj learn of the Top Model House

November 11, 2008 – Penny gets three strikes from Sheldon

Saturday, November 15, 2008, they eat at cheesecake factory – Penny ruins laundry night, but Leonard gives Penny Sheldon's Mom's telephone number. She makes Sheldon rescind strikes.

November 16, 2008 – Raj & Howard visit the Top Model House

25. “The Lizard-Spock Expansion”

November 17, 2008 - Howard needs help at the Mars rover lab, Leonard meets Stephanie

November 18, 2008  – Leonard & Stephanie on a date

November 19, 2008  – Leonard & Penny talk in the laundry room about Stephanie

November 20, 2008 – Leonard & Howard make up

November 21, 2008 – news of life discovered on Mars

26. “The White Asparagus Triangulation”

November 24, 2008 – Sheldon talks with Penny, then intrudes on Leonard and            Stephanie's date

November 25, 2008 -  Sheldon intrudes on Leonard and Stephanie's movie date

November 26, 2008 – Sheldon gives Penny zucchini bread, and Leonard hurt in           Sheldon's plan to make him appear macho

December 1, 2008 – Sheldon changes Leonard's Facebook status

27. “The Vartabedian Conundrum”

December 8, 2008 – Leonard & Sheldon discuss the roommate agreement cohabitation clause

December 9, 2008 – Penny shows Leonard Stephanie has moved in

December 10, 2008  – Leonard dumps Stephanie

28. “The Bath Item Gift Hypothesis”

December 16, 2008 – the boys meet David Underhill

December 16, 2008  – they do wii bowling 

December 17, 2008 – Penny meets  David

December 18, 2008 – Sheldon shops at Bath & Bodyworks, Leonard is  depressed until    Penny dumps David when she learns he is married

December 25, 2008 – Penny gives Sheldon a napkin signed by Leonard Nimoy 

29. “The Killer Robot Instability”

January 12, 2009 – MONTE complete, Penny insults Howard

January 13, 2009  – Howard is in a funk, they are challenged by Kripke

January 14, 2009 – Penny visits Howard, MONTE destroyed

30. “The Friendship Algorithm”

January 19, 2009 – Sheldon decides to become Kripke's friend

January 20, 2009 – Sheldon hands out a questionnaire to current friends

January 21, 2009 – Sheldon berates Leonard s answers, trip to bookstore

January 22, 2009 – Sheldon's flowchart  on how to make a friend

January 23, 2009 – Sheldon goes rock climbing with Kripke

January 24, 2009 – Sheldon tries rock climbing again 

31. “The Financial Permeability”

February 2, 2009 – Sheldon lends money to Penny 

February 3, 2009 – Leonard visits Kurt to collect money he owes Penny

February 4, 2009 – Penny repays Sheldon after Kurt repays her

32. “The Maternal Capacitance”

February 9, 2009 – Leonard learns his Mom will be visiting

February 10, 2009 – his Mom arrives

February 11, 2009 – his Mom visits Cal Tech, Leonard & Penny drink

February 12, 2009  – Leonard's Mom leaves

33. “The Cushion Saturation”

February 28, 2009 – Howard & Leslie hook up in the paintball shed

March 1, 2009 – Penny shoots the cushion in Sheldon's spot

March 2, 2009 – at supper Sheldon can't sit

March 3, 2009 – the cushion returns [error says schezuan palace closed 2 ya, but ate there 1ya ago ]

March 7, 2009 Leslie Winkle's sister gets married

March 8, 2009 – in paintball Sheldon  shoots Penny in revenge for shooting cushion 

34. “The Terminator Decoupling”

March 9, 2009 – the boys tell Penny about their San Francisco trip

March 10, 2009 -  Sheldon packs

March 11, 2009 – the train trip up the coast

March 12, 2009 – the conference

35. “The Work Song Nanocluster”

March 16, 2009 – Sheldon helps  Penny with her business

March 17, 2009 – she gets a 5000 ‘Penny blossoms’ order & they work al night to make  them

March 18, 2009 – she gets another order for 5000

36. “The Dead Hooker Juxtaposition”

March 30, 2009 – they discuss the tenant of 5A moving out

March 31, 2009 – the boys arrive to help Howard move out of Mom's house

April 1, 2009 – Alicia moves in to Apartment 5A

April 2, 2009 – Penny buys supper for the guys

April 3, 2009 – the catfight between Penny and Alicia

April 4, 2009 – fight aftermath with Penny's black eye

mid-April 2009 Raj's research into the composition of Trans-Neptunian objects reaches a dead-end  [the Pirate Solution]

37. “The Hofstadter Isotope”

Thursday, April 16, 2009  – Penny goes to comic book store to get a birthday gift for her nephew and meets Stuart

Friday, April 17, 2009 – Penny & Stuart go to art show 

38. “The Vegas Renormalization”

April 27, 2009 – Leslie dumps Howard 

April 28, 2009 – Leonard and Raj take Howard to Las Vegas where they buy him a  prostitute 

April 29, 2009 – they return to Pasadena

Raj had sex [per The Spaghetti  Catalyst]

39. “The Classified Materials Turbulence”

May 4, 2009 – Stuart asks Penny out on a date

May 5, 2009 – Stuart talks to Leonard, Stuart's date w/ Penny, Howard has problems  with the space toilet & they try to fix  

May 6, 2009 – everyone has a Thai meal 

40. “The Monopolar Expedition”

May 11, 2009 – Sheldon gets an e-mail from Dr. Siebert about National Science           Foundation expedition to the magnetic North pole

May 12, 2009 – Leonard, Raj and Howard decide to go with Sheldon

May 13, 2009 – Sheldon asks Penny if they can use the Cheesecake Factory freezer to practice

May 14, 2009 – the freezer test

May 15, 2009 – everyone talks to talk to Dr & Mrs Koothrapali  via webcam

May 16, 2009 Penny says to herself that she wishes Leonard wasn't going

May ___, 2009 – at MNP

Notes[]

While it is generally presumed that the first day of an episode is the date it is broadcast, there are exception, as at the start of this season.

Season 3[]

This chronology is a timeline of events that happened during the third season, approximately August 2009 to May 2010.

August 16, 2009 Sheldon sends notes to Beverly Hofstadter hre paper on quantum brain function  [The Maternal Congruence]

41. “The Electric can opener fluctuation”

August 16, 2009 – return after 3 months at magnetic north pole

August 17, 2009 – Sheldon runs away to Texas

August 18, 2009 – Leonard, Raj & Howard travel to Texas, talk Sheldon into returning

August 19, 2009 – Penny & Leonard finally hook up

42. "The Jiminy Conjecture"

August 20, 2009 – Everyone discusses Leonard and Penny's hookup last night, they catch a cricket

August 21 or 22, 2009 – they meet Dr. Crawley & Leonard & Penny decide not to just stay friends

August, 2009 – August 2010 Sheldon goes accidentally on booze cruise to Mexico [The Friendship Contraction]

September 22, 2009 – Leonard's mother and father divorce.

43. “The Gothowitz deviation” 

Monday October 5, 2009 -  Sheldon tries operant conditioning on Penny, while Howard & Raj go to a Goth club, but don't get tattoos

44. “The Pirate Solution”   

October 12, 2009 Raj is to be deported

October 14, 2009 - interview with Laughlin and Millstone, Sheldon asks Raj to help with “string theory implications of gamma rays from dark matter annihilation” 

October 15, 2009    Raj accepts the job with Sheldon

October 16, 2009 – Howard interrupts Leonard and Penny's night together, Sheldon & Raj disagree

Monday, October 18, 2009 -  Howard makes breakfast, Raj & Sheldon make up

45. “The Creepy Candy Coating Corollary”

October 19, 2009 – after playing “mystic Warlords of Ka’ah” Howard invokes the girlfriend pact with Leonard

October 20, 2009  – Howard reminds Leonard who asks Penny

Saturday, October 24, 2009 – mystic warlords of ka’ah tournament. Howard and   Bernadette's first date

October 28,2009 - suborbital test launch of the Jupiter-120 rocket

46. “The Cornhusker Vortex”

October 31, 2009 – after kite fighting Leonard invited to Penny's football party

November 2, 2009 – after Monday night football, Sheldon teaches Leonard about football

Saturday, November 7, 2009  – the football party

47. “The Guitarist Amplification”

November 9, 2009 – discussion of  Justin arriving

November 10, 2009 – Penny and Leonard keep arguing

November 11, 2009 – Sheldon at the Cheesecake Factory, big fight between Penny and Leonard

Sunday, November 15, 2009 – Justin arrives and sleeps on Leonard & Sheldon's couch

48. “The Adhesive Duck Deficiency” 

Monday, November 16, 2009  Raj, Howard & Leonard watch meteors, Penny dislocates  her shoulder, Sheldon gets a ticket  

49. “The Vengeance Formulation”

November 30, 2009 – Howard & Bernadette's third date

December 1, 2009 – Sheldon announces he will be on NPR ‘next week’

Thursday, December 10, 2009  – Sheldon asks Howard to review talking points

Friday, December 11, 2009, Sheldon is on Science Friday, Howard's bath where he        fantasizes about  Katie Sackhoff and later proposes to Bernadette

December 12, 2009 – Sheldon's revenge on Kripke

50. “The Gorilla Experiment”

December 14, 2009 – Bernadette express interest in Leonard's work

December 15, 2009 – Penny asks Sheldon to teach her “a little physics”, Howard      confronts Leonard

December 16, 2009 – Sheldon teaches Penny a little physics

December 17, 2009 – Howard & Bernadette square off in Leonard's lab

December 18, 2009 – a meal with everyone

Sometime in 2009 - Bernadette's grandmother dies [The Maternal Congruence]

51. “The Maternal Congruence”

December 21, 2009 – Sheldon complains about Christmas shows

December 22, 2009 – Penny & Leonard decorate tree

December 23, 2009 – Leonard's mom arrives, goes out with Penny

December 24, 2009 – she leaves

52. “The Psychic Vortex”

January 11, 2010 – Howard & Bernadette double date with Leonard & Penny, who gets  upset when Leonard mocks her belief in psychics, Raj and Sheldon go out meet Abby & Martha

January 12, 2010 – Raj bribes Sheldon to go out again with the girls 

53. “The Bozeman Reaction”

January 18, 2010 – a break- in at Leonard and Sheldon's apartment

January 19, 2010 – Howard installs a security system 

January 20, 2010 – Sheldon leaves

January 21, 2010 – Sheldon in Bozeman

January 24, 2010 – Sheldon returns

54. “The Einstein Approximation”

February 2, 2010 – Sheldon stuck on a problem, Leonard, Penny, Howard and Bernadette  go disco roller skating,   Sheldon plays in ball pit

February 3, 2010 – Sheldon goes in Penny's apartment

February 4, 2010 – Sheldon visits the employment office

February 6,2010 - Sheldon works at the Cheesecake  Factory

55. “The Large Hadron Collision”

February 8, 2010 – Leonard tells of trip to Geneva

February 9, 2010 – lunch at Cal Tech

February 10, 2010 – Sheldon plots to go on the trip by playing on Penny's sympathy

February 12,2010 - Leonard and Raj depart for Geneva

February 14, 2010 - Leonard & Raj in Geneva 

February 17,2010 - Leonard and Raj return from Geneva

56. “The Excelsior Acquisition”

March 1, 2010 – Sheldon learns he got a ticket & about Stan Lee comic book signing

Thursday, March 4, 2010 – comic book signing & Sheldon in court 

March 5, 2010 – Penny and Sheldon visit Stan Lee

57. “The Precious Fragmentation”

March 8, 2010 – they buy a box of stuff find a ring  

March 9, 2010 – they learn what the ring is, Sheldon tries to steal

March 10, 2010 – the contest to see who gets ring

March 11, 2010 – Leonard mails the ring to Peter Jackson, Sheldon tries to steal

58. “The Pants Alternative”

March 22, 2010 – Sheldon learns he won Chancellor's science award, but must give a speech

March 23, 2010 – intervention, Sheldon does yoga with Raj 

March 24, 2010 – Sheldon goes shopping with Penny and psychoanalysis with Leonard   

March 25, 2010- the banquet and speech

March 26, 2010 – Sheldon has questions about last night 

59. “The Wheaton Recurrence”

April 12, 2009 – Leonard tells Penny “I love you” 

April 13, 2009 – bowling w/Wil Wheaton 

April 14, 2009 – Penny dumps Leonard [8 months after “the Electric Can Opener        Fluctuation” as per “the Decoupling Fluctuation]

April 15, 2009 – guys at the comic book store in female super hero outfits 

60. “The Spaghetti Catalyst”

May 3, 2010 – Sheldon eats with both Penny & the guys

May 4, 2010 – Penny & Leonard talk in the laundry room   

Saturday, May 8, 2010 – Penny takes Sheldon to Disneyland 

61. “The Plimpton Stimulation”

May 10, 2010 – they learn of Elizabeth Plimpton's  arrival

May 11, 2010 – Elizabeth Plimpton arrives and hooks up with Leonard

May 12, 2010 – Penny confronts Leonard  

62. “The Staircase Implementation”

May 17, 2010 - Sheldon & Leonard fight

63. “The Lunar Excitation”

May 25, 2010 – they point a laser at the Moon with Zack and Penny there

May 26, 2010 – find Amy Farrah Fowler, Leonard talks to Leslie Winkle

May 29, 2010 – Sheldon & Amy meet for first time

April, 2010 to August, 2010 - Howard has his disastrous non-date with Emily Sweeney [The Relationship Diremption]

Season 4[]

Timeline

This chronology is a timeline of events that happened during the Fourth Season, approximately July 2010 to June 2011.

July 2010 Jim Lee sketches Leonard at ComicCon The Good Guy Fluctuation

64. “The Robotic Manipulation”

September 23, 2010 – Howard introduces the robot hand

September 24, 2010 – Sheldon & Amy's date, Howard at the emergency room

65. “The Cruciferous Vegetable Amplification”

Thursday, September 30, 2010 – Sheldon discusses the singularity

October 1, 2010 – Sheldon & Penny go jogging

October 2, 2010 – Sheldon introduces the mobile presence device

October 3, 2010 – Sheldon sees Steve Wozniak 

October 4, 2010 – Penny sings soft kitty to the MPD

66. “The Zazzy Substitution”

October 5, 2010 – Amy meets Penny

October 6, 2010 – the guys meet at Penny's apartment 

October 7, 2010 – Sheldon & Amy break –up

October 9, 2010 – Sheldon & Penny talk in the laundry room

October 10, 2010 – Sheldon buys cats

October 11, 2010 – Sheldon's Mom arrives

October 12, 2010= Sheldon & Amy pay people to take cats

67. “The Hot Troll Deviation”

Tuesday October 12, 2010 – Howard sees Bernadette at the Cheesecake Factory

October 13, 2010 – Sheldon lets Raj buy desk, Howard talks to Penny about getting back together with Bernadette

October 14, 2010 – Raj moves in desk, Howard & Bernadette  meet

October 15, 2010 – Sheldon & Raj's war 

October 16, 2010 – Howard and Bernadette neck in the car

October 17, 2010 – Sheldon wears a gas mask

68. “The Desperation Emanation”

October 21, 2010 – Leonard is lonely, Sheldon asked to meet Amy's mom 

October 22, 2010 – Leonard invokes girlfriend pact with Howard

October 23, 2010 – Leonard's’ date with Joy

October 24, 2010 – Sheldon meets Amy's mom 

69. “The Irish Pub Formulation”

October 26, 2010 – Priya arrives

October 27, 2010 – lunch discussion about Priya

October 28, 2010 – insect sno-cones

70. “The Apology Insuffiency”

November 4, 2010 – Howard announces he's applying for a security clearance

November 5, 2010 – Agent Page visits Raj, Leonard & Sheldon 

November 6, 2010 – Howard doesn't get clearance

November 7, 2010 – Sheldon meets Agent Page & Neil de Grasse Tyson 

November 8, 2010 – Sheldon give Howard his spot

71. “The 21 Second Excitation”

November 11, 2010 – Penny watches Raiders of the Lost Ark

Friday Nov 12, 2010 – the guys go to see the film, the girls have a slumber party

Sheldon & Leonard go to the arcade [The Itchy Brain Stimulation]

72. “The Boyfriend Complexity”

November 18, 2010 – Wyatt arrives

November 19, 2010 – Wyatt leaves

At Thanksgiving, 2010 Penny and Zack go to Las Vegas and think they are fake married by an Elvis impersonator, however they really are married [The Thanksgiving Decoupling]

73. “The Alien Parasite Hypothesis”

December 9, 2010 – Amy sees Zack

December 10, 2010 – Zack and Amy meet

74. “The Justice League Recombination”

December 16, 2010 – they are invited to New Year's Eve party

December 31, 2010 Zack is Superman at the  comic book store party

75. “The Bus Pants Utilization”

January 6, 2011 – Leonard gets the idea for an equation app

January 7, 2011 – Sheldon is fired from the group

76. “The Love Car Displacement”

Tuesday, January 18, 2011 – Penny is  invited to Big Sur conference

January 21, 2011 – they leave for Big Sur

January 22, 2011  – the conference

77. “The Thespian Catalyst”

February 3, 2011 – Sheldon lectures

February 4, 2011 – Sheldon asks Penny for lessons in acting

Saturday, February 5, 2011  – his first lesson

February 6, 2011 – his second lesson

78.  “The Benefactor Factor”

February 10, 2011 – Dr. Siebert tells about a reception  for donors

Saturday, February 12, 2011 – the donors reception

Sunday, February 13, 2011 –Leonard & Mrs. Lambert  date

February 14, 2011 – second Leonard & Mrs Lambert date

February 15, 2011 - Leonard at Cal Tech

79. “The Cohabitation Formulation”

February 17, 2011 – Howard & Bernadette argue and Leonard visits Priya

February 20, 2011 – they eat at the Cheesecake factory 

February 21, 2011 – Howard briefly moves in with Bernadette

February 22, 2011 – Sheldon and Penny share a meal 

80. “The Toast Derivation”

Thursday, February 24, 2011 -  everyone eats at Raj's 

February 25, 2011 – Sheldon's new group of friends meet

81. “The Prestidigitation Approximation”

March 10, 2011 – Howard shows card trick                      

March 11, 2011 – Leonard tries to tell Penny to stay away 

March 12, 2011 – Penny interrupts Leonard & Priya's date at restaurant

March 13, 2011  – Sheldon tries card trick

March 14, 2011 – Sheldon tries card trick

82. “The Zarnecki Incursion”

March 31, 2011 – Sheldon's world of warcraft account hacked 

April 1, 2011 – they visit the hacker and Penny kicks him in the scrotum

April 2, 2011 – Penny & Priya climb the stairs in silence

83.. “The Herb Garden Germination”

April 7, 2011 – Sheldon and Amy attend a lecture by   Brian Greene 

April 8, 2011 – Sheldon and Leonard play wii archery

April 9, 2011 – rumor that Bernadette is going to dump Howard

April 10, 2011 – Howard says going to propose, Sheldon and Amy start rumor

April 11, 2011 – Howard proposes to Bernadette and she accepts

April, 2011 Penny gets a call back on hemorrhoid commercial [The Skank Reflex]

84. “The Agreement Dissection”      

April 28, 2011 - Sheldon's bathroom emergency & dancing night

April 29, 2011 Sheldon blackmails Priya and Leonard                                      

85. “The Wildebeest Implementation”

May 5, 2011 – Sheldon invents 3 handed chess and dinner of Leonard, Priya, Howard & Bernadette 

86. “The Engagement Reaction”

May 12, 2011 – Howard and Bernadette asked about wedding plans

May 13, 2011 – Howard's Mom and Bernadette have lunch, Mrs. Wolowitz in hospital

May 28, 2011 – 2 weeks later it is the end of Sheldon's quarantine

87. “The Roommate Transmogrification”

June 2, 2011 – Bernadette gets her Doctorate

June 3, 2011 – Raj moves in with Sheldon, Leonard learns Priya is moving back to India

June 4, 2011 – Raj & Penny emerge from Leonard's bedroom after a night of drinking. 

Season 5[]

This chronology is a timeline of events that happened during the Fifth season or approximately June 2011 to May 2012

2011 Amy starts shaving her legs The Vacation Solution

88. “The Skank Reflex Analysis” June 4, 2011 – Leonard has an analysis session with his mom

Saturday, June 6, 2011 – the boys play paintball –penny gets commercial

day 3 – watch commercial  -much later 89. "The Infestation Hypothesis"

June 9, 2011 – Leonard's dinfast with Priya

June 10, 2011 – Sheldon tries to get rid of Penny's new chair

June 11, 2011 – Howard demonstrates cybersex devices, the chair thrown out

90. "The Pulled Groin Extrapolation"

June 16, 2011 – Amy stays & drafts Leonard to attend a wedding with her, Howard  and Bernadette fight about where they're going to live

Friday, June 17, 2011 – Leonard & Amy go to a wedding 

Saturday, June 18, 2011 – Bernadette serves Howard breakfast

91. "The Wiggly Finger Catalyst"

June 23, 2011 – Howard & Bernadette register at Macy's

June 24, 2011 – play D&D

June 25, 2011– Raj meets Emily

July 25, 2011 – learn Raj rich, Raj gives gifts to Emily 

July 26, 2011 -  Penny confront Emily

July 27, 2011 - Raj dumps Emily due to parents threat

July 28, 2011 – Raj seeks comfort from Penny 

92. "The Russian Rocket Reaction"

October 6, 2011 – Howard going to space, invited to Wil Wheaton's party

October 13, 2011 – discussion of Bernadette telling Howard's mom about space

October 14, 2011 – Wil Wheaton's party

93. "The Rhinitis Revelation"

October 20, 2011 – Mrs Cooper arrives

October 22, 2011 – Sheldon & mom do laundry

October 23, 2011 – tour Hollywood, Sheldon gets sick

94. "The Good Guy Fluctuation"

October 27, 2011 – Howard & Raj scare Sheldon

October 28, 2011 – Leonard meets Alice

October 29, 2011 – Leonard talks with Penny, ends it with  Alice & Priya

95. "The Isolation Permutation"    

November 3, 2011 – discussion of bridesmaid dresses

November 4, 2011 – Penny & Bernadette go shopping

November 5, 2011 – guys tell Penny & Bernadette that Amy upset

November 6, 2011 – Penny & Bernadette talk to Amy who gets drunk

November 7, 2011 – Bernadette asks Amy to be maid of honor

November 8, 2011 – Penny, Amy & Bernadette go shopping

96. "The Ornithophobia Diffusion"

November 10, 2011 – Leonard & Penny go to movies, Sheldon terrorized by bird

97. “The Flaming Spittoon Acquisition”

November 17, 2011 – Stuart meets Amy

November 18, 2011 – Stuart texts Amy

November 19, 2011 – Stuart & Amy date

November 20, 2011 – boys play mystic warlords

November 21, 2011 – Sheldon asks Penny out, then asks Amy to be girlfriend

November 22, 2011 – girls play twister

98. "The Speckerman Recurrence"

December 10, 2011 – Leonard gets e-mail from Jimmy Speckerman

December 11, 2011 – Leonard meets Jimmy Speckerman, girls visit charity bin

December 12, 2011 – Jimmy Speckerman chases Sheldon & Leonard, girls return to bin

Jan, 2012 Penny dings a Mercedes, but doesn't leave note [The Vacation Solution]

99. "The Shiny Trinket Maneuver"

Thursday, January 12, 2012 –  Sheldon & Amy on date & gets upset

January 13, 2012 – Penny and Sheldon go jewelry shopping

100. “The Recombination Hypothesis”

January 19, 2012 – Leonard asks Penny out

101. “The Beta Test Initiation”

January 19, 2012 – Leonard & Penny's date

January 20, 2012 – they watch Dr. Who

January 21, 2012 – Siri dinner & shooting range

102. "The Friendship Contraction"

February 2, 2012 – Leonard drives Sheldon to train store in Garden Grove 

February 3, 2012 – they end roommate agreement

February 4, 2012 – power outage

February 5, 2012 – Howard talks to Mass

103. "The Vacation Solution"

Friday February 10, 2012 -  Dr. Siebert tells Sheldon must take vacation

Monday, Feb. 13, 2012 -  Sheldon tries to sneak in to work

February 14, 2012 – Sheldon at Amy's lab

February 15, 2012 – Sheldon apologizes

February 16, 2012 –Howard & Bernadette discuss pre-nup

104. "The Rothman Disintegration”

February 16, 2012 – Prof Rothman's retirement party

February 17, 2012 – Amy gives picture

February 18, 2012 – Sheldon & Kripke argue

February 19, 2012 – Sheldon & Kripke play basketball

February 20, 2012 – Sheldon moves in office

105. "The Werewolf Transformation"

February 23, 2012 – Sheldon doesn't get haircut from Angelo 

Monday, February 24, 2012 -  Howard in Houston, Sheldon at hospital

February 25, 2012 – Howard returns from survival training

February 26, 2012 – Bernadette goes to Houston, mom already there, Penny cuts       Sheldon's hair

106. "The Weekend Vortex"

March 8, 2012 - games weekend proposed

March 9, 2012 – Sheldon shops at comic book store for present for Amy's aunt Flora 

Saturday, March 10, 2012 – 93rd b-day party Amy's aunt flora, Amy makes scene

107. "The Transporter Malfunction”    

March 29, 2012 – discuss Raj wants to get married

March 30, 2012 – meets Lakshmi

March 31, 2012 – date with Lakshmi, Sheldon breaks toy  `

April 1, 2012 – Raj ends with Lakshmi, Sheldon confesses

108. “The Hawking Excitation"

April 5, 2012 – Howard says Hawking coming to Cal Tech

April 6, 2012 – talk about Hawking

April 7, 2012 – Sheldon cleans Howard's belt buckles 

April 8, 2012 – Sheldon dresses as French maid

April 8, 2012 – Sheldon shops with Mrs. Wolowitz

April 10, 2012 - meets Hawking, faints 109. “The Stag Convergence”

April 26, 2012 – discuss bachelor party

April 27, 2012 – bachelor party

110. "The Launch Acceleration"

May 3, 2012 – mission cancelled

May 10, 2012 – guys shop, Amy & Sheldon's date. Leonard proposes

111. “The Countdown Reflection"

Friday – May 10, 2012 – Howard gives star necklace

Sunday May 12, 2012 – wedding of Howard & Bernadette

May 15, 2012 – Howard is launched into space

Notes[]

It is presumed that the first day of an episode is the date that episode was broadcast, but there are exceptions as in this season. 'The Wiggly Finger Catalyst' takes a month and would mess up the rest of the timeline.


Season 6[]

This chronology is a timeline of events that happen during the Sixth Season, or approximately between May 2012 and May 2013.

112. “The Date Night Variable"[]

  • May 28, 2012 – Discuss Sheldon & Amy's date; Howard tells mom he is not moving.
  • May 28, 2012 – 2nd anniversary of Amy & Sheldon's first date, Bernadette confronts Howard.
  • May 30, 2012 – Bernadette & Howard talk.

113. “The Decoupling Fluctuation”[]

  • July 6, 2012 – girls discuss boyfriends, they go to movies, Sheldon talks to Penny,:Howard & Bernadette talk.
  • July 6, 2012 – they play cards, Penny can't break up with Leonard.
  • July 7, 2012 – Penny talks with Amy & Bernadette.
  • July 8, 2012 – Howard gets graffiti written on his face in space.

114. “The Higgs Boson Observation”[]

  • August 9, 2012 – Howard & Bernadette talk.
  • August 10, 2012 – Sheldon interviews Alex.
  • August 11, 2012 – Amy gets suspicious of Alex, then Penny does.

115. “The Re-Entry Minimization”[]

  • September 21, 2012 – Howard returns from orbit.
  • September 22, 2012 – Howard returns to LA.

116. “The Holographic Excitation"[]

  • October 25, 2012 – discuss Stuart's Halloween party.
  • October 26, 2012 – Penny visits Leonard's lab,
  • October 27, 2012 – Penny visits Leonard at lab.
  • October 31, 2012 – Halloween party at the comic book store.

117. “The Extract Obliteration"[]

November 1, 2012 – Sheldon starts words with friends with Steven Hawking, Penny is back taking 1 course at college 

November 2, 2012 – Penny tells Leonard about her course  

November 5, 2012 – Howard has not played, Leonard rewrites 

November 6, 2012 – Penny mad at Leonard

November 8, 2012 – Penny got B- on paper by Amy & Bernadette, Hawking wins 

118. “The Habitation Configuration”

November 8, 2012 – during filming ‘Fun with Flags’  Amy asks Sheldon to tell Wil Wheaton to leave, when he don’t she does leave 

November 9, 2012 – Howard & Bernadette argue at the Cheesecake Factory re Howard moving out, Sheldon visits Amy

November 10, 2012 – Howard moves.  Sheldon visits Wil Wheaton

November 11, 2012 – Fun With Flags & Levar Burton

119. “The 43 Peculiarity”

November 15, 2012 – discuss Sheldon’s disappearance at 2:45  

November 16, 2012 – Raj & Howard follows Sheldon, enter room

November 17, 2012 – Howard & Raj discuss 43, Penny says she loves Leonard 

November 18, 2012 – spycam on Sheldon

November 19, 2012 – Sheldon plays hacky sack

120. “The Parking Spot Escalation’

November 29, 2012 – Howard gets assigned Sheldon’s parking spot 

November 30, 2012 – Sheldon steal Howard’s IronMan helmet, Howard sits on couch  naked

December 1, 2012 – after Bernadette has Amy’s car towed, Amy hits Penny

December 2, 2012  – Sheldon sits in parking spot, Sheldon & Howard agreement

December 3, 2012 – make-up dinner at Cheesecake Factory 

December 4, 2012 – Sheldon takes cushion to dry cleaners 

121. “The Fish Guts Displacement”

December 6, 2012 – Amy gets sick,  Howard and Bernadette’s eat with her parents  

December 7, 2012 – Penny teaches Howard how to fish

December 8, 2012 – Amy gets spanked, Howard & Mike go fishing 

122. “The Santa Simulation”

December 13, 2012 – discuss plying Dungeons & Dragons

Dec 15, 2012 - play Dungeons &Dragons, Raj w/girls at bar 

123. ‘The Egg Salad Equivalency”

January 3, 2013 – Alex asks Leonard to dinner

January 4, 2013 -  Sheldon’s council of ladies 

January 5, 2013 – Sheldon talks to Alex

January 6, 2013 – Sheldon at human resources  

January 7, 2013 – Leonard, Howard & Raj at human resources, tells Alex to take course

January 8, 2013 -  Penny‘s smart glasses

124. “The Bakersfield Expedition”

January 12, 2013 trip to Bakersfield con, girls read comics

125. “The Cooper-Kripke Inversion”

January 31, 2013 – Howard and Raj order action figures

February 1, 2013 – Sheldon & Kripke have to work together

February 2, 2013 -  Sheldon & Kripke trade work, Howard & Raj order 3D printer 

February 3, 2013 – Sheldon pretends to be sick and then to have sex with Amy,              Bernadette gets made at Howard about 3D printer

February 4, 2013 – Howard sells his half of 3D printer

126. “The Spoiler Alert Segmentation”

February 7, 2013 – Leonard moves out

February 9, 2013 -  Raj eats dinner with Mrs Wolowitz

February 10, 2013 – Raj still there,  big 4 way fight between Sheldon, Amy, Penny      and Leonard 

127. “The Tangible Affection Proof”

February 12, 2013 – Penny & Leonard have supper

February 13, 2013 – Raj & Stuart plan Valentine’s Day party 

February 14, 2013 – Alex buys gifts,  Penny sees Gretchen, Raj meets Lucy            

February 15, 2013 – Sheldon has an ice cream headache 

February 16, 2013 – Sheldon thinks he’s bitten by a Chinese bird spider

128. “The Monster Isolation”

February 14, 2013 – is day  3 of tangible affection proof 

February 21, 2013 – Sheldon’s Fun With Flags episode with Penny, Howard, Leonard and Bernadette visit Raj  

February 22, 2013 – Sheldon web chats with Amy, he thanks Penny, Lucy returns

Friday, February 23, 2013 – A Streetcar Named Desire performance, Lucy visits Raj

129. “The Contractual Obligation Implementation”

March 7, 2013 – the guys discuss promoting women in science 

Friday, March 8, 2013 – Sheldon, Leonard & Howard go to his school & girls skip &  Raj’s date 

130. “The Closet Reconfiguration”

Monday, March 31, 2013 – at party Sheldon finds letter from Howard’s father to Howard

March 16, 2013 – the girls force Sheldon to talk

March 17, 2013 – other party where  they reveal/don’t reveal message to Howard 

131. “The Tenure turbulence””

March 28, 2013 – they learn of Professor Tupperman’s death 

March 29, 2013 – everyone smoozes Ms. Davis & learns the tenure committee will be at  Professor Tupperman’s memorial service

Thursday, April 4, 2013 - memorial service for Professor Tupperman 

April 5, 2013 – Sheldon apologizes to Ms. Davis

April 13, 2013 –Sheldon finds a curly fry in his regular fries, makes an unscheduled video call to Amy [The Raiders Minimization]

132. “The Closure Alternative”[]

April 25, 2013 – discuss Sheldon’s disquiet at cancellation of Alphas, Raj finds Lucy’s Blog online.

  • April 26, 2013 – Amy has a plan for Sheldon.
  • April 27, 2013 – Leonard & Penny watch Buffy the Vampire Slayer.
  • April 28, 2013 – Amy puts plan in effect, Bernadette & Penny talk about enthusiasm, Raj and Lucy's date.

133. “The Proton Resurgence”[]

  • May 2, 2013 – Sheldon finds Professor Proton (Arthur Jeffries, Ph. D from Cornell) online.
  • May 3, 2013 – Raj asks Howard to watch Cinnamon.
  • May 4, 2013 -  Raj brings Cinnamon over to Howard's.
  • May 5, 2013 – Cinnamon goes missing & Professor Proton comes over.
  • May 6, 2013 – Sheldon fills in at a Korean family in Alhambra.

134. “The Love Spell Potential”[]

  • May 9, 2013 – girls don't go to Vegas, and play dungeons & dragons with the guys.

135. “The Bon Voyage Reaction”[]

  • May 16, 2013 – Howard tells Leonard he recommended him to Steven Hawking.
  • May 17, 2013 – Leonard tells Penny.
  • May 18, 2013 – party discussed.
  • May 19, 2013 – Lucy meets Amy.
  • May 20, 2013 – Sheldon & Penny shop for party.
  • Friday, May 21, 2013 – party.
  • May 22, 2013 – Leonard leaves.

Season 7[]

Timeline

This chronology is a timeline of events that happened during the seventh season or approximately July 2013 to May 2014.

136. “The Hofstadter Insufficiency

July 25, 2013 – Sheldon's nightmare about Leonard

July 26, 2013 – Raj & Howard at mixer, Amy & Bernadette at conference, Penny &   Sheldon hang out together

137. “The Deception Verification”

September 26, 2013 – Leonard returns

September 27, 2013 – Sheldon learns Leonard has returned

September 28, 2013 – Sheldon is an ass

September 29, 2013 – a meal

138. “The Scavenger Vortex”

October 3, 2013 - discuss hunt

October 4, 2013 – the hunt

139. “The Raiders Minimization”

October 10, 2013 – Sheldon & Amy watch Raiders of the Lost Ark    

October 11, 2013 – Sheldon reads Pride and Prejudice

 October 12, 2013 – Raj & Stuart photograph themselves

October 13, 2013 – Leonard & Penny have sex at work

October 14, 2013 – Raj & Stuart online, Sheldon & Amy watch Little House on the  Prairie, Penny's revenge 

140. “The Workplace Proximity”

October 17, 2013 – Sheldon & Amy on date night at the Cheesecake Factory   

October 18, 2013 – guys discuss working with girls, Howard  & Bernadette fight

October 19, 2013 – lunch at CAL tech;  Howard  & Bernadette fight again

October 20, 2013 – Leonard ‘talks’ to Howard & Sheldon

141. ”The Romance Resonance”

October 22, 2013 – they eat at the Cheesecake Factory

October 23, 2013 – Sheldon finds a new element 

October 24, 2013 – discuss song & element, Penny consults with Raj, Sheldon's error 

October 25, 2013 – Bernadette's in quarantine & Howard's sings a song to her

October 26, 2013 – Penny's dinner for Leonard, Amy's daydream

142 “The Proton Displacement”

October 30, 2013 – Amy, Sheldon & Leonard meet Proton in drugstore

October 31, 2013 – Leonard gets e-mail from Professor Proton

Friday, November 1, 2013 – girls jewelry night

November 2, 2013 – Sheldon visits Professor Proton at 7 am

November 3, 2013 – at Leonard and Professor Proton's experiment, Sheldon shows up  with Bill Nye 

Friday, November 8, 2013 – second jewelry night

November 9, 2013 – Amy visits Sheldon

143 – “The Itchy Brain Simulation”

November 14, 2013 – Leonard tells Sheldon about un-returned DVD, Penny confronts  Lucy

November 15, 2013 – Leonard tells Sheldon the owner of the video store is dead, Raj eats with Howard & Bernadette

November 16, 2013 – Raj has coffee with Lucy, Sheldon tells Leonard  he paid the late   fee on the DVD

Novemner 16, 2013 -  Raj has coffee with Lizzy

144 – “The Thanksgiving Decoupling”

November 27, 2013 – get invited to thanksgiving, Penny learns she's married

November 28, 2013 – (Thanksgiving)  Penny & Zack's marriage annulled

145 – “The Discovery Dissipation”

November 29, 2013 – Sheldon on “Science Friday”

November 30, 2013 – Sheldon plays w/trains, Wil shows up, Raj moves in with Howard & Bernadette, Leonard disproves

December 1, 2013 – Leonard posts his paper, Howard & Bernadette kick Raj out

December 5, 2013 –  Sheldon on “Science Friday”

146 – The Cooper Extraction

December 12, 2013 – learn about Missy's baby

December 13, 2013 – rest decorate the tree,  Missy's son born

December 14, 2013 – Sheldon returns & Stuart daydreams about Penny 

147 – “The Hesitation Ramification”

January 2, 2014 – Penny has good news

January 6, 2014 – they eat at the Cheesecake Factory

January 7, 2014 – Penny's scene cut from the 246th episode of NCIS

January 8, 2014 – Sheldon works on theory of humor; Penny proposes, Leonard declines

148 – “The Occupation Recalibration”

January 9, 2014 – Leonard & Penny reconcile, Penny quits working at Cheesecake Factory

January 10, 2014 – Sheldon starts enforced vacation,   Bernadette tries to replace destroyed comic book, Bert likes Amy and she ends up agreeing to  a date with him, but Raj and Howard get her out of it. Penny and   Sheldon travel around together. 

January 13, 2014 – Raj and Howard attend rock and mineral show with Bert

149 – “The Convention Conundrum”

January 30, 2014 – The guys fail to get Comic-con tickets online.

January 31, 2014 – Sheldon decides to set up his own convention.

February 1, 2014 – Sheldon calls Robert Downey, Jr. The girls go to tea. The boys decide not to buy scalped Comic-con tickets. Sheldon hangs out with James Earl Jones.

150. – “The Locomotive Manipulation”

February 6, 2014 – Amy tells Sheldon plan to travel with Bernadette and Howard to Napa  Valley on a train.

February 7, 2014 – the group discusses the trip, Leonard and Penny agree to watch Cinnamon

February 14, 2014 – Amy, Sheldon, Howard & Bernadette board the train, Cinnamon  eats chocolate & gets taken to vet, Yvette  Sheldon meets Eric and ignores Amy, but after a confrontation Sheldon kisses Amy.Yvette gives Raj her telephone number.

February 15, 2014 – Sheldon tells Leonard he kissed Amy

151 – “The Table for Polarization”

February 27, 2014 – it is suggested that Sheldon & Leonard get a dining room table

February 28, 2014 – Leonard & Penny go to buy a table, Howard gets call about returning to outer space

March 1, 2014 – the table is installed in the apartment, Sheldon tries to break up with      Amy, Howard's intervention

March 3, 2014 – Howard goes to the doctor

March 4, 2014 – the eat at the apartment  on the table

152. ‘The Friendship Turbulence”

March 5, 2014 – Raj watches “West Side Story”

March 6, 2014 – they discuss Penny's acting career

March 7, 2014 – Howard invites Sheldon to Houston, Raj gets Amy to contact Emily, Penny's car dies

March 8, 2014 – they play risk, Emily turns down Raj,

March 9, 2014 - Howard & Sheldon leave for Houston, Leonard gives Penny a car, Rmily and Amy's coffee date

153. “The Mommy Observation”

March 13, 2014 -they play Raj's murder mystery game, while Sheldon and Howard pay an  unexpected visit to his mother

154. “The Indecision Amalgamation”

April 2, 2014 -   Sheldon can't decide between X-box and PS 3, Penny gets an offer to star in   “Serial Apeist 2; Monkey See, Monkey Kill”, Raj meets Emily again

April 3, 2014   -  Sheldon ruins date night with Amy, Penny decides to take part,  Raj gets  text from Lucy

April 4, 2014 - Penny and Leonard meet Wil Wheaton

April 6, 2014 - Amy and Leonard go to the store, Raj's date with Emily

April 7, 2014  - Penny and Wil Wheaton start filming Serial Apeist 2: Monkey  See, Monkey Kill.                

155. “The Relationship Diremption”

April 10, 2014 – Sheldon questions his work on string theory.

April 11, 2014 – Raj arranges a double date for him and Emily with Howard and Bernadette

April 12, 2014 -   Sheldon gets a haircut from Penny, then drinks too much & Emily and Howard and Bernadette's double date

April 13, 2014 -    Sheldon wakes up to find he was reading about Geology and called     Hawking. He and Howard talk.

156. “The Proton Transmogrification”

May 1, 2014 -  Arthur Jeffries dies

May 2, 2014 – Sheldon watches Professor Proton on YouTube

May 4, 2014 – Leonard and Penny go to Arthur Jeffries funeral, Sheldon dreams of      Professor Proton, Amy and Bernadette bake a Death Star cake

157. “The Gorilla Dissolution”

May 8, 2014 – Mrs. Wolowitz injured in treadmill accident

May 9, 2014 – Howard & Bernadette discuss Mrs. Wolowitz's care

May 10, 2014 – Raj and Sheldon go to see The Amazing Spiderman 2 and meet Emily. Penny and Will Wheaton get fired from Serial Apeist 2: Monkey See, 'Monkey Kill, Penny and Leonard get engaged

May 12, 2014 – Howard and Bernadette relax while the nurse works

158. “The Status Quo Combustion”

May 15, 2014 – Penny and Leonard announce they are engaged

May 16, 2014 -  Sheldon meets with President Siebert about changing field of study, Another nurse quits, Leonard tells his Mom about his engagement, .Penny tells her family, and very briefly works as Mrs. Wolowitz's nurse. The Comic Book store catches on fire.

May 17, 2014 – Sheldon writes e-mail to faculty senate. Sheldon and Leonard discuss  new living arrangements. Sheldon vents to Amy, then goes to the train station

May 18, 2014 – Stuart is working as Mrs. Wolowitz's caregiver.

See also[]

Timeline of Young Sheldon

Advertisement