Timeline of Events that Happened in the Fourth Season

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

TimelineSection heading
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

<p class="MsoNormal">October 11, 2010 – Sheldon’s Mom arrives

<p class="MsoNormal">October 12, 2010= Sheldon & Amy pay people to take cats

<p class="MsoNormal">67. “The Hot Troll Derivation”

<p class="MsoNormal">Tuesday October 12, 2010 – Howard sees Bernadette at the Cheesecake Factory

<p class="MsoNormal">October 13, 2010 – Sheldon lets Raj buy desk, Howard talks to Penny about getting back t ogether with Bernadette

<p class="MsoNormal">October 14, 2010 – Raj moves in desk, Howard & Bernadette   meet

<p class="MsoNormal">October 15, 2010 – Sheldon & Raj’s war

<p class="MsoNormal">October 16, 2010 – Howard and Bernadette neck in the car

<p class="MsoNormal">October 17, 2010 – Sheldon wears a gas mask

<p class="MsoNormal">68. “The Desperation Emanation”

<p class="MsoNormal">October 21, 2010 – Leonard is lonely, Sheldon asked to meet Amy’s mom

<p class="MsoNormal">October 22, 2010 – Leonard invokes girlfriend pact with   Howard

<p class="MsoNormal">October 23, 2010 – Leonard’s’ date with Joy

<p class="MsoNormal">October 24, 2010 – Sheldon meets Amy’s mom

<p class="MsoNormal">69. “The Irish Pub Formulation”

<p class="MsoNormal">October 26, 2010 – Priya arrives

<p class="MsoNormal">October 27, 2010 – lunch discussion about Priya

<p class="MsoNormal">October 28, 2010 – insect sno-cones

<p class="MsoNormal">70. “The Apology Insuffiency”

<p class="MsoNormal">November 4, 2010 – Howard announces he’s applying for a security clearance

<p class="MsoNormal">November 5, 2010 – Agent Page visits Raj, Leonard & Sheldon

<p class="MsoNormal">November 6, 2010 – Howard doesn’t get clearance

<p class="MsoNormal">November 7, 2010 – Sheldon meets Agent Page & Neil de Grasse Tyson

<p class="MsoNormal">November 8, 2010 – Sheldon give Howard his spot

<p class="MsoNormal">71. “The 21 Second Excitation”

<p class="MsoNormal">November 11, 2010 – Penny watches Raiders of the Lost Ark

<p class="MsoNormal">Friday Nov 12, 2010 – the guys go to see the film, the girls have a slumber party

<p class="MsoNormal">Sheldon & Leonard go to the arcade [The Itchy Brain Stimulation]

<p class="MsoNormal">72. “The Boyfriend Complexity”

<p class="MsoNormal">November 18, 2010 – Wyatt arrives

<p class="MsoNormal">November 19, 2010 – Wyatt leaves

<p class="MsoNormal">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]

<p class="MsoNormal">73. “The Alien Parasite Hypothesis”

<p class="MsoNormal">December 9, 2010 – Amy sees Zack

<p class="MsoNormal">December 10, 2010 – Zack and Amy meet

<p class="MsoNormal">74. “The Justice League Recombination”

<p class="MsoNormal">December 16, 2010 – they are invited to New Year’s Eve party

<p class="MsoNormal">December 31, 2010 Zack is Superman at the   comic book store party

<p class="MsoNormal">75. “The Bus Pants Utilization”

<p class="MsoNormal">January 6, 2011 – Leonard gets the idea for an equation app

<p class="MsoNormal">January 7, 2011 – Sheldon is fired from the group

<p class="MsoNormal">76. “The Love Car Displacement”

<p class="MsoNormal">Tuesday, January 18, 2011 – Penny is   invited to Big Sur conference

<p class="MsoNormal">January 21, 2011 – they leave for Big Sur

<p class="MsoNormal">January 22, 2011   – the conference

<p class="MsoNormal">77. “The Thespian Catalyst”

<p class="MsoNormal">February 3, 2011 – Sheldon lectures

<p class="MsoNormal">February 4, 2011 – Sheldon asks Penny for lessons in acting

<p class="MsoNormal">Saturday, February 5, 2011   – his first lesson

<p class="MsoNormal">February 6, 2011 – his second lesson

<p class="MsoNormal">78. “The Benefactor Factor”

<p class="MsoNormal">February 10, 2011 – Dr. Seibert tells about a reception   for donors

<p class="MsoNormal">Saturday, February 12, 2011 – the donors reception

<p class="MsoNormal">Sunday, February 13, 2011 –Leonard & Mrs. Lambert   date

<p class="MsoNormal">February 14, 2011 – second Leonard & Mrs Lambert date

<p class="MsoNormal">February 15, 2011 - Leonard at Cal Tech

<p class="MsoNormal">79. “The Cohabitation Formulation”

<p class="MsoNormal">February 17, 2011 – Howard & Bernadette argue and Leonard visits Priya

<p class="MsoNormal">February 20, 2011 – they eat at the Cheesecake factory

<p class="MsoNormal">February 21, 2011 – Howard briefly moves in with Bernadette

<p class="MsoNormal">February 22, 2011 – Sheldon and Penny share a meal

<p class="MsoNormal">80. “The Toast Derivation”

<p class="MsoNormal">Thursday, February 24, 2011 -   everyone eats at Raj’s

<p class="MsoNormal">February 25, 2011 – Sheldon’s new group of friends meet

<p class="MsoNormal">81. “The Prestidigitation Approximation”

<p class="MsoNormal">March 10, 2011 – Howard shows card trick

<p class="MsoNormal">March 11, 2011 – Leonard tries to tell Penny to stay away

<p class="MsoNormal">March 12, 2011 – Penny interrupts Leonard & Priya’s date at restaurant

<p class="MsoNormal">March 13, 2011   – Sheldon tries card trick

<p class="MsoNormal">March 14, 2011 – Sheldon tries card trick

<p class="MsoNormal">82. “The Zarnecki Incursion”

<p class="MsoNormal">March 31, 2011 – Sheldon’s world of warcraft account hacked

<p class="MsoNormal">April 1, 2011 – they visit the hacker and Penny kicks him in the scrotum

<p class="MsoNormal">April 2, 2011 – Penny & Priya climb the stairs in silence

<p class="MsoNormal">83.. “The Herb Garden Germination”

<p class="MsoNormal">April 7, 2011 – Sheldon and Amy attend a lecture by    Brian Greene

<p class="MsoNormal">April 8, 2011 – Sheldon and Leonard play wii archery

<p class="MsoNormal">April 9, 2011 – rumor that Bernadette is going to dump Howard

<p class="MsoNormal">April 10, 2011 – Howard says going to propose, Sheldon and Amy start rumor

<p class="MsoNormal">April 11, 2011 – Howard proposes to Bernadette and she accepts

<p class="MsoNormal">April, 2011 Penny gets a call back on hemorrhoid commercial [The Skank Reflex]

<p class="MsoNormal" style="tab-stops:181.5pt">84. “The Agreement Dissection”

<p class="MsoNormal" style="tab-stops:181.5pt">April 28, 2011 - Sheldon’s bathroom emergency & dancing night

<p class="MsoNormal" style="tab-stops:center 3.0in">April 29, 2011 Sheldon blackmails Priya and Leonard

<p class="MsoNormal">85. “The Wildebeest Implementation”

<p class="MsoNormal">May 5, 2011 – Sheldon invents 3 handed chess and dinner of Leonard, Priya, Howard & Bernadette

<p class="MsoNormal">86. “The Engagement Reaction”

<p class="MsoNormal">May 12, 2011 – Howard and Bernadette asked about wedding plans

<p class="MsoNormal">May 13, 2011 – Howard’s Mom and Bernadette have lunch, Mrs. Wolowitz in hospital

<p class="MsoNormal">May 28, 2011 - 2 weeks later it is the end of Sheldon’s quarantine

<p class="MsoNormal">87. “The Roommate Transmogrification”

<p class="MsoNormal">June 2, 2011 – Bernadette gets her Doctorate

<p class="MsoNormal">June 3, 2011 – Raj moves in with Sheldon

<p class="MsoNormal">June 4, 2011 – Raj & Penny emerge from Leonard’s bedroom