The Big Bang Theory

The Staircase Implementation (Season 3, Episode 22)

TV-PG

TV Episode | 20 min | Comedy, Romance

Leonard tells Penny about how he and Sheldon became roommates and what happened to the elevator.

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Cast	+ Add Cast
10 cast members

Name	Known for
Johnny Galecki Leonard Hofstadter Leonard Hofstadter See fewer	The Big Bang Theory (2007)
Jim Parsons Sheldon Cooper Sheldon Cooper See fewer	The Big Bang Theory (2007)
Kaley Cuoco Penny Penny See fewer	The Big Bang Theory (2007)
Simon Helberg Howard Wolowitz Howard Wolowitz See fewer	Florence Foster Jenkins (2016)
Kunal Nayyar Raj Koothrappali Raj Koothrappali See fewer	The Big Bang Theory (2007)
Carol Ann Susi Debbie Wolowitz (voice) Debbie Wolowitz (voice) See fewer	Cats & Dogs (2001)
Ally Maki Joyce Kim Joyce Kim See fewer	Toy Story 4 (2019)
Steven Yeun Sebastian Sebastian See fewer	Minari (2020)
Ajgie Kirkland Louie Louie See fewer	The Big Lebowski (1998)
Ed Lieberman Announcer (voice) Announcer (voice) See fewer	Happy Gilmore (1996)