A Lookback Of Every Characters In The Big Bang Theory. Who Is Your Favorite?

Steven Yeun as Sebastian

Now this one is for the real fans. Steven Yeun, AKA Sebastian, was Sheldon’s roommate BEFORE Leonard. Though in the series, they didn’t get along all that much and his minor appearance is just for a single episode. Yeun has been on the hit show The Walking Dead for seven seasons now. 

Steven Yeun As Sebastian