The Big Bang Theory (2007– )
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The Collaboration Fluctuation 

Leonard, Penny and Raj adjust to their new living arrangements; Sheldon expresses an interest in Amy's work.



(created by), (created by) | 6 more credits »

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Episode complete credited cast:
Halley Wolowitz (voice)


Raj has now moved in with Leonard and Penny. Instead of a roommate for both of them, what Raj becomes is Penny's closest girlfriend, with Leonard feeling left out. It's not even so much that Leonard feels like a third wheel or that Raj is having a better time with his wife than he is that is the problem in Leonard's rational deduction about his emotions. Leonard turns to Howard and Bernadette for solace and advice, they who may be able to provide a different perspective on the matter. Meanwhile, Sheldon has taken an interest in Amy's work on the neuroscience of the decision making process. He believes that throwing a little physics into the mix would lead to a truly revolutionary project, to which Amy agrees. Even with ground rules laid out, Amy and Sheldon have to decide if the successes in the project are worth the anguish of the arguments and name calling which may ultimately ruin their personal relationship. Written by Huggo

Plot Summary | Add Synopsis


Comedy | Romance


TV-PG | See all certifications »





Release Date:

30 March 2017 (USA)  »

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Technical Specs


Sound Mix:


Aspect Ratio:

16:9 HD
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Did You Know?


This episode was taped on March 7, 2017. See more »


Penny's apartment, where Sheldon and Amy are now living, is on the 4th floor of the building, same as Leonard's apartment, but the view outside the one window suggests they couldn't be higher than the second floor. See more »


[first lines]
Raj Koothrappali: So, Downward Facing Dog comes from the Sanskrit phrase Adho Mukha Svanasana.
Penny Hofstadter: Oh, that's beautiful. What does it mean?
Raj Koothrappali: Downward facing dog.
Penny Hofstadter: Yeah, I guess they don't have Sanskrit for butts up and heads down.
Raj Koothrappali: Hey, we wrote the Kama Sutra; if it involves butts there's a word for it.
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References Star Trek (1966) See more »


History of Everything (Instrumental version)
Written by Barenaked Ladies
Performed by Barenaked Ladies
[Instrumental version of series theme song played over the closing credits]
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User Reviews

Well Beyond its Prime
1 April 2017 | by See all my reviews

Alas, but the show is well beyond its prime. Still watch because there is little to compete with it, but the story line has become very thin, too many actors given a few lines each, only 18 minutes of story vs a normal 22, and let's face it, what is there left for the writers to come up with? All the stories have been done. The main story in this one, between Sheldon and Amy, has been worn out on the show. And the best second story is "wanna go to Target with us to get some diapers?" Weak. I did not laugh one time during the show, which is becoming common with all of the new ones.

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