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The Big Bang Theory S4E17 poster

Watch The Big Bang Theory – Season 4 Episode 17: The Toast Derivation

The Big Bang Theory • Season 4, Episode 17 • 21 min • 2007 • ⭐ 7.9/10 • Comedy

Cast: Jim Parsons , Kaley Cuoco , Johnny Galecki , Simon Helberg , Kunal Nayyar , Melissa Rauch , Mayim Bialik

Directors: Chuck Lorre , Bill Prady

Watch The Big Bang Theory – S4E17

Episode Overview

Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.

Episode Navigation

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