Season 4 · Episode 17 · Overall #80
The Toast Derivation
Aired February 24, 2011 Directed by Mark Cendrowski Written by Story by : Bill Prady & Dave Goetsch & Maria Ferrari | Teleplay by : Chuck Lorre & Steven Molaro & Jim Reynolds
About This Episode
Sheldon starts his own social group and Leonard isn't invited. The rival friend group creates apartment tension.
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