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The Big Bang Theory/The Toast Derivation
From The TV IV
| The Toast Derivation | |
| Season 4, Episode 17 | |
| Airdate | February 24, 2011 |
| Production Number | 3X6667 |
| Teleplay by | Chuck Lorre & Steven Molaro & Jim Reynolds |
| Story by | Bill Prady & Dave Goetsch & Maria Ferrari |
| Directed by | Mark Cendrowski |
| Stream |  |
| ← 4x16 The Cohabitation Formulation |
4x18 → The Prestidigitation Approximation |
| The Big Bang Theory — Season Four | |
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The Toast Derivation is the seventeenth episode of the fourth season of The Big Bang Theory, and the eightieth episode overall.
Starring: Johnny Galecki (Dr. Leonard Hofstadter), Jim Parsons (Dr. Sheldon Cooper), Kaley Cuoco (Penny), Simon Helberg (Howard Wolowitz), Kunal Nayyar (Dr. Rajesh "Raj" Koothrappali), Mayim Bialik (Amy Farrah Fowler), Melissa Rauch (Bernadette Rostenkowski)
Special Guest Star: LeVar Burton (Himself)
Guest Starring: Kevin Sussman (Stuart), Brian Thomas Smith (Zack), John Ross Bowie (Barry Kripke), Aarti Mann (Priya)
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