The Big Bang Theory (2007– )
2 user 1 critic

The Recombination Hypothesis 

Leonard and Penny contemplate reviving their romantic relationship.


Mark Cendrowski


Chuck Lorre (created by), Bill Prady (created by) | 3 more credits »


Airs Sat. Jan. 19, 8:00 PM on TBS





Episode complete credited cast:
Johnny Galecki ... Leonard Hofstadter
Jim Parsons ... Sheldon Cooper
Kaley Cuoco ... Penny
Simon Helberg ... Howard Wolowitz
Kunal Nayyar ... Raj Koothrappali
Mayim Bialik ... Amy Farrah Fowler
Melissa Rauch ... Bernadette Rostenkowski
Jim Turner ... Reverend White


After thinking about it long and hard, Leonard decides to ask Penny out on a real date again, which not only garners a shocked reaction from Penny, but the same from the rest of their mutual friends. Penny accepts Leonard's date request. While Bernadette and Amy give Penny their two cents worth of advice, Howard and Raj give Leonard theirs. After what can be described as a disastrous date, Leonard and Penny make a decision on what to do about whether or not to get back together again. Much of their decision is based on Penny's assertion that Leonard over-thinks everything. An action by Leonard shows just how much he over-thinks everything. Meanwhile, Sheldon contemplates whether or not to keep the "Zachary Quinto" life-sized cardboard cutout of Spock he received, when he really ordered the "Leonard Nimoy" Spock. And a clueless Sheldon, while playing a game with Howard and Raj, has no idea his comments are laced with sexual innuendo. Written by Huggo

Plot Summary | Plot Synopsis


Comedy | Romance


See all certifications »

Parents Guide:

View content advisory »






Release Date:

19 January 2012 (USA) See more »

Company Credits

Show more on IMDbPro »

Technical Specs


Sound Mix:




Aspect Ratio:

16:9 HD
See full technical specs »

Did You Know?


When Penny is describing her acting career she forgot to mention her performance of the musical "Rent" that Sheldon and Leonard avoided due to the quality of her singing. See more »


When Sheldon tells Leonard "lizard weathermen would say things like, 'Bring a sweater. It's slow outside,'" he is incorrect. As cold-blooded animals, lizards would not generate warmth to be retained by wearing clothing. See more »


[first lines]
Leonard Hofstadter: Feel like trying something new for dinner? Maybe indian? Tex-Mex?
Sheldon Cooper: You ever wonder how humans would be different if they evolved from lizards instead of amammals?
Leonard Hofstadter: Okay, let's talk about that.
Sheldon Cooper: As you know, lizards, cold-blooded animals, lack the ability to sense temperature, but they do move more sluggishly when it's cold. So, lizard weathermen would say things like, "Bring a sweater. It's slow outside". I love my mind.
Leonard Hofstadter: We all do. Now, how about dinner?
Sheldon Cooper: Oh, I would assume we'd enjoy ...
See more »

Crazy Credits

CHUCK LORRE PRODUCTIONS, #374 ONE HUNDRED EPISODES Babies were born, people got married, people got divorced, people died, people were hired, fired, quit, homes were bought, expensive cars were leased, tears were shed, harsh words were spoken, fear, dread, resentment, jealousy, frustration and rage came and went like clouds in the sky. The only constant was laughter. We laughed a lot. We hope you did too. From everyone at The Big Bang Theory, thank you for watching. Oh, I almost forgot! Bill Prady went on a food delivery system, lost twenty pounds and started tucking in his shirt. See more »


References Star Trek (2009) See more »


The Lounge Pianist
Music by Dick Walter
See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

I most definitely loved this "The Recombination Hypothesis" ep of "The Big Bang Theory"
15 November 2012 | by tavmSee all my reviews

OMG! This was the most hilarious ep of "The Big Bang Theory" that I've seen so far! And it's only the one hundredth! I mean, Sheldon says "wood" and "erection" and doesn't get the double entendres that Howard and Raj obviously do! Anyway, the whole ep has Leonard and Penny agreeing to a dinner date and the results of the aftermath. Both Bernadette and Amy approve but for different reasons and neither can agree on what kind of clothing Penny should wear. Oh, and Sheldon got his Spock cardboard cutout...but it's not the classic one but the latest one, if you know what I mean. So on that note, "The Recombination Hypothesis" ep of "The Big Bang Theory" is very highly recommended.

4 of 10 people found this review helpful.  Was this review helpful to you? | Report this
Review this title | See all 2 user reviews »

Contribute to This Page

IMDb Freedive: Watch Movies and TV Series for Free

Watch Hollywood hits and TV favorites for free with IMDb Freedive. Start streaming on IMDb and Fire TV devices today!

Start watching

Stream Action and Adventure Titles With Prime Video

Explore popular action and adventure titles available to stream with Prime Video.

Start your free trial

Recently Viewed