The Big Bang Theory

Season 5 Episode 13

The Recombination Hypothesis

Aired Monday 8:00 PM Jan 19, 2012 on CBS



  • Trivia

    • The opening scene is nearly identical to the opening scene of the pilot episode: Leonard and Sheldon arrive at their apartment and spot Penny doing something in her apartment through her open door, and Leonard goes to talk to her. The characters are even dressed similarly, with Leonard wearing a crimson shirt with a hoodie and Sheldon in a superhero T-shirt and checked pants, and Penny wearing the exact same shirt she wore in the pilot.