Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.
| Title | The Toast Derivation |
|---|---|
| Genres | Comedy |
| Release Date | 2011-02-24 |
| Episode Runtime | 00 Hours 22 Minutes |
| Season Number | 4 |
| Episode Number | 17 |
| Production Companies | Chuck Lorre Productions, Warner Bros. Television |
