The Big Bang Theory: Season 3 Episode 22: The Staircase Implementation
Starring: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Carol Ann Susi
Length: 20 minutes
On Air Date: 28 Jul 2010
The Big Bang Theory: S03E22 Description: Leonard tells Penny about how he and Sheldon became roommates and what happened to the elevator.