The Big Bang Theory - Season 4 Episode 17 The Toast Derivation
Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.
- Genre: Comedy
- Studio: CBS
- Keyword: geek, nerd, friends, scientist, sitcom
- Cast: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Melissa Rauch