The Big Bang Theory (2007–2019)
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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.


Mark Cendrowski


Chuck Lorre (created by), Bill Prady (created by) | 6 more credits »




Episode complete credited cast:
Johnny Galecki ... Leonard Hofstadter
Jim Parsons ... Sheldon Cooper
Kaley Cuoco ... Penny Hofstadter
Simon Helberg ... Howard Wolowitz
Kunal Nayyar ... Raj Koothrappali
Mayim Bialik ... Amy Farrah Fowler
Melissa Rauch ... Bernadette Rostenkowski
Pamela Adlon ... Halley Wolowitz (voice)
Tiffany Daniels ... Clerk
Doug Morency ... Stranger


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 »

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.
See more »


References Star Trek: The Original Series (1966) See more »


Happy Together
Written by Alan Gordon & Gary Bonner
Performed by The Turtles
[The song is played when Leonard, Penny and Raj are out shopping together, and later when Amy and Sheldon are working on their project together]
See more »

User Reviews

Good written, amazingly acted!
2 March 2019 | by SmokinBrownSee all my reviews

Just me trip over about the plot of Amy and Sheldon, and all the mapping with topics like real life relationships, marriage, couple sex life, passion, angry?! I have to admit that Leonard's part of the story was flat, like this planet. xD Beside all this, best thing of this episode was the acting! Brilliant moments, fights, dialogues as in the best theatrical improvisation shows.

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English | Sanskrit

Release Date:

30 March 2017 (USA) See more »

Company Credits

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Technical Specs


Sound Mix:




Aspect Ratio:

16:9 HD
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