The Fermentation Bifurcation

"The Fermentation Bifurcation" is the twenty-second episode of the ninth season of the American sitcom The Big Bang Theory. The episode aired on Thursday, April 28, 2016.

Summary
The gang goes to a and run into Penny’s old, Zack. Also, Bernadette gets stuck spending the with Sheldon when she can’t drink, and things don’t go as planned when Raj introduces his new , Claire.

Extended Plot
While fixing, Penny tells them that she won a of  at work. Leonard wonders why don't win things. Howard claims that they are in it for the. Sheldon claims that he is just pursues for the intrinsic joy of. Amy reminds him that he always says that he wants to win a. Howard, Amy, Raj and Leonard plan on going; however, Bernadette is and Sheldon has had enough of. Sheldon then tells Bernadette that it'll just be the two of them. "Me? How? Why?", exclaimed a shocked Bernadette. Sheldon wanted her to join him and explained that all the things she has to avoid, he never liked in the first place. She decides to give it a try. Sheldon tells her to come and "party hardly".Working on their, the   system, in the Mechanical Engineering Lab, Raj wonders if he can bring Claire. Leonard wondered if he was still Emily. Raj concurs and says that he is keeping the two. Howard is ready to start up their gyroscope while Sheldon documents it on. The three rotating start up successfully. Raj thinks it looks, while it makes Howard and Leonard. Sheldon falls down dizzy while trying to it.

Raj calls up Claire and invites her to the. She is fine with it as long as meeting his friends is not too big a step. Claire wants to know if she'll be introduced as his and what happens if they don't like each other.

Leonard is reading a about wine tasting. Leonard can't really anything because his  are acting up. Sheldon tells Penny that he is going to prove that you can have fun without, , , , , , 's or anything else that is harmful to a pregnant lady. Then Sheldon drives Leonard and Penny out of the apartment after his list of verboten things get more disgusting.

At the wine tasting, Howard and Amy are the first to arrive. At first they are with nothing to say; then they remember that the last time they were together, it was three  ago during the. They though they should do it again, but they never did. Amy mentions about Bernie and Sheldon hanging out together and she has no idea what they are going to about. Leonard, Penny and Raj show up. Claire is going to meet them there and Raj doesn't want them to ask too many since they are keeping it casual. Leonard then won't ask her about how it is being in his. Amy then notices Zack, her old boyfriend, however, Penny doesn't know whether she want to talk to him. Peeved Raj wants her to ask who was better in the .Bernadette shows up with some bubbly which unfortunately s Sheldon's. Sheldon has a friendly  of fun discussing  and types of  that thrills Bernadette.The guys are describing what they smell in the wine, except for stopped-up Leonard. Zack comes by to say. Zack sees that they are and wonders if it's to each other. Despite breaking up with Leonard and keep coming back to Zack, he was always rooting for them. The guys tell Zack about their navigational system and he wonders if it could be misused by the. Zack then asks if it better than the one they're using now. "Yea!" they exclaim as they realize that the military would want it. Zack then wonders if they really are.

Sheldon is describing the various s. The smallest gauge he accidentally  and had to pass. Bernie wondered why he liked trains. was confusing when he was young and trains represented order. He could line them up, categorize them, etc. They gave Sheldon a sense of in a  that did not.

Leonard is talking to Howard that he is worried about the military applications ever since Zack mentioned it. Raj adds that any scientific advancement can be used for purpose. Amy cites and the development of the. Penny knows the equation and what the letters mean. Claire then joins them and is introduced as a causal friend who need no other questions. Leonard asks her if she would like some wine. Raj shouts that he said no questions.

Now Sheldon has laid out all the different types of toast including Star Wars toast. It has a light side and a "". Next on the evening's is D&amp;D. Bernadette says that she might play for a little while. Sheldon doesn't think that she will want to stop or will be allowed to. The game was designed for her. Her character's name is Bernadetrix, a tall brave queen. She likes being tall. Also only the men get pregnant in this universe. She thinks it might be fun. She starts out having a at the. Bernadette says that she storms into the tavern, throws down her and wants his strongest  in the  of a.

Penny tells Claire that they have heard nothing, but good things about her. Claire stumps them by asking what they had heard. Zack comes over and then hits on Claire. Raj counters that she is seeing him. Zack asks why she was introduced as his friend since she is so great. Claire says that she doesn't know, so Zack then asks Raj who is stumped. Leonard is still worried about their and wants to take another look at it. Howard doesn't want to stop because he needs the. How do they know that their invention is not going to be used to destroy the world? Howard retorts that no one has come back from the to kill them.

Back at D&D, Bernadette is killing the that attacked her. After being in a, the ogre is reduced to sushi and begs to be eaten. Bernadette enjoys the sushi, bathes in the hot spring and does not have swollen. The end. The night was much more fun than she thought it would be. She thanks him since for one night she didn't have to be "pregnant Bernadette". Sheldon tells her that if she ever needs another break, Bernadetrix the Warrior is there for her. Only unto the third because he can't risk getting  on his spot.

Raj asks Zack to not come onto Claire since he is bigger and more. Zack apologies. Raj doesn't want him to talk about how great Claire is. That's fine with Zack. Claire then asks Penny and Amy if he brings around other s. The girls are stumped. Leonard calls Raj to a fault. Zack comes over and tells everyone that Raj is right that Claire is not so great. Raj counters with that he says crazy things all the time. So what had they been talking about while he was gone? Claire kids him that they were discussing all of of the girls he had been dating. Raj complains that he didn't want them to mention that. Penny tells him that they didn't, he did.

Leonard wakes up, walks into the and tells Sheldon that he over did it that previous night. Sheldon did to, but it was making too much toast. Leonard then inquires if Sheldon has ever thought about the military applications. It first bothered him and then he talked to Alicia and Fred about it and they put it into. Leonard wondered who these people were. Sheldon tells him that friends are like since it's always good to have a couple of extra under the.

Credits

 * Guest starring:
 * Brian Smith as Zack Johnson
 * Alessandra Torresani as Claire
 * Teleplay: Chuck Lorre, Steve Holland & Tara Hernandez
 * Story: Steven Molaro, Jim Reynolds & Anthony Del Broccolo

Critics

 * Jesse Schedeen of IGN - For a show as formulaic and set in its ways as The Big Bang Theory, the best episodes are often the ones that push the characters out of their comfort zones...Most importantly, the wine tasting story line addressed the growing problem that is Raj and his generally obnoxious behavior this season. On one hand, his desire to invite Claire and formally introduce her to the group was a rare sign of maturity. There was a sense that Raj generally does care about this woman and wants to move the relationship forward, even if he can't bring himself to cut ties with Emily...Back home, the Sheldon/Bernie story definitely lived up to its potential...Several times over the past few seasons, Sheldon has shown signs of emotional maturity and a desire to do something nice for his friends for no other reason than because it's the right thing to do. This was one of those cases.
 * IMDb user reviews

Trivia

 * Zack Johnson will return in this episode and makes Leonard think about how their invention might be used by the military.
 * Claire meets some more of the gang.
 * Sheldon's first official bonding with Bernadette.
 * Zack still loves science.
 * Howard and Amy stated that they last hung out together 3 years ago. This could be a reference to "The Scavenger Vortex" (S7E3), when they both bonded over their love of.
 * After Leonard announces the start of their experiment, Sheldon wants his friend James Earl Jones to dub it.
 * When describing toast, Sheldon doesn't mention Cylon toast from "The Cornhusker Vortex".
 * Penny also demonstrated her limited knowledge of the E=MC2 equation in "The Roommate Transmogrification".

Quotes

 * Sheldon: Leonard, friends are like toilet paper; it's good to have extras under the sink.


 * Penny: Oh, hey, if you guys are free this weekend, I won a night of wine tasting from work.
 * Leonard: That sounds fun. Mmmmm. How come scientists don’t win free stuff like salespeople do?
 * Howard: ‘Cause we’re not in it for the stuff. We’re in it for the groupies.
 * Sheldon: Personally. I find the notion of external rewards demeaning. I pursue science for the intrinsic joy of discovery.
 * Amy: But you always say that you want to win a Nobel Prize.
 * Sheldon: I also say don’t contradict me in front of my friends, but that you don’t remember.
 * Raj: I would love to. I do enjoy the complexity of an aged Pinot noir.
 * Leonard: I’m sure that would pair nicely with your fried nuggets if chicken.
 * Amy: Well, it sounds like a nice night. We should go.
 * Sheldon: Wine again? Yeah, no, thank you. I like my grapes the old-fashioned way in a juice box.
 * Amy: Well, I’m going. You couldn’t stop me from getting a massage in the mall, and you’re not stopping me now.
 * Sheldon: I shouldn’t have to see my girlfriend get groped in public by another man in public.
 * Amy: And I shouldn’t have to see my boyfriend riding on a train for children around the mall.
 * Penny: The little choo-choo for toddlers?
 * Amy: And now you know why I needed the massage.
 * Howard: Well, we’re out. Bernie can’t drink ‘cause she’s pregnant. And she’s pregnant because we had sex. And we had sex because…. [laughs] well, come on.
 * Bernadette: It’s okay. You should go.
 * Howard: You sure?
 * Bernadette: Of course.
 * Penny: Yeah, give her a break from, “Well, come on.”
 * Sheldon: Well, Bernadette, looks like Saturday night, it’s just you and me.
 * Bernadette: Me? How? Why?
 * Sheldon: Well, it makes perfect sense. Because you’re an expectant mother, you can’t drink alcohol. I don’t like to. You can’t have sushi. I don’t like to. You can’t go in hot tubs. I consider them vats of sweaty people soup.
 * Bernadette: Gee, Sheldon. I don’t know.
 * Sheldon: Oh come on. Roller coasters, caffeine, runny eggs- I’ve been avoiding those things all my life. And now, because you’re pregnant, you have to.
 * Leonard: The difference is she’s bringing life into the world, and you suck it out.
 * Bernadette: I guess we could give it a try.
 * Sheldon: Well, little lady, you’ve heard of party hearty; get ready to party hardly.
 * Howard: I bet you’d like a drink now.


 * Raj: Hey, you think it’d be okay if I brought Claire to the wine tasting?
 * Leonard: Sure. I’d like to meet her.
 * Raj: Oh, that’s great. I’ve been wanting her to meet you guys, too, so this seems like the perfect opportunity.
 * Shelden: Oh, but I won’t be there.
 * Raj: Funny how that worked out.
 * Leonard: Does this mean Emily’s not in the picture anymore?
 * Raj: No, I’m still dating her.
 * Leonard: Okay, help me out. Howa are you doing this? Do they know about each other?
 * Raj: They know that we’re not exclusive, and we don’t ask too many questions.


 * Raj: Hey, guys, do me a favor and don’t ask too many questions about our relationship. We’re just keeping it casual.
 * Leonard: Oh, so I shouldn’t ask her how she feels about being a member of your harem?


 * Bernadette: So what do you want to do tonight?
 * Sheldon: Oh, I have quite an evening planned. Our fetus-friendly festival of fun begins with an in-depth look at the world of model trains, and then we’ll kick things up a notch and explore all the different ways you can make toast.


 * Zack: Hey, did you two get married?
 * Penny: We did.
 * Leonard: Yeah, mmm.
 * Zack: To each other?
 * Penny: Yes.
 * Zack: Cool. Cause other than when you broke up with him and dated me, then broke up with me, and then dated me one more time before getting back to him, I was rooting for you two.


 * Zack: Are you kidding? I love science. Einstein. Stephen hawking. Mike deGrasse Tyson.
 * Amy: Mike deGrasse Tyson?
 * Howard: Yeah, you know, the boxer who grew a mustache and became a scientist.


 * Bernadette: What is it about trains that you like so much?
 * Sheldon: What an interesting question. Well, when I was a child, life was confusing and chaotic for me, and trains represented order. I could line them up, categorize them, control them. I guess you could say that they gave me a sense of calm in a world that didn’t.


 * Sheldon: And last, but not least, this is one I like to call Star wars toast because…it has a light side and a “Dark Side”.


 * Amy: So Claire, we’ve heard so many wonderful things about you.
 * Claire: Really? Like what?
 * Amy: Uh, mostly, Penny’s heard them.
 * Zack: Boy, you get some dirty looks over there when you ask for ice.
 * Raj: Zack, this is my friend Claire.
 * Zack: You’re hot. You seeing anybody?
 * Raj: Uh, she’s seeing me.
 * Zack: Why’d you say she’s your friend?
 * Raj: We’re just keeping it casual.
 * Zack: Why is he being casual with you? You seem great.
 * Claire: I don’t know. Ask him.
 * Zack: Why are you being casual with her? She seems great.


 * Bernadette: Wow, this night turned out to be so much more fun than I thought.
 * Sheldon: Oh the fun doesn’t stop. You’re still going home with a goodie bag full of toast.
 * Bernadette: Thank you for this. You know, ever since people found out I’m having a baby, I feel like I became “Pregnant Bernadette”. It was nice to take a little break tonight.


 * Zack: I see what you’re saying. She’s not so great.
 * Raj: Don’t listen to him. He says crazy things all the time. Uh watch. Marco!
 * Zack: Polo!
 * Raj: So, uh, what are you guys talking about?
 * Claire: Your friends were just telling me about all the other girls you’re dating.
 * Raj: Why would you do that? I specifically asked you not to do that.
 * Penny: We didn’t.
 * Amy: You just did.
 * Zack: Wow. Maybe none of you guys are smart.