The Big Bang Theory/The Toast Derivation

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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
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The Big Bang TheorySeason 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)


Plot Overview


Arc Advancement





The Show

Behind the Scenes

Allusions and References

Memorable Moments