Guest Star: Steven Yeun
You are viewing a list of Steven Yeun's 1 appearance on The Big Bang Theory.
Season 3, Episode 22 - The Staircase Implementation
Aired May 17, 2010
After a disagreement with Sheldon, Leonard tells Penny the story of how he moved into the apartment building, became friends with Sheldon, and how the elevator was broken.
Appeared as Sebastian