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"The Toast Derivation" (Season 4, Episode 17 of The Big Bang Theory ) centers on Sheldon attempting to rebuild his social circle after realizing Leonard has replaced him as the group's "nucleus". The episode, which originally aired on February 24, 2011, features guest appearances from LeVar Burton, Stuart Bloom, Zack Johnson, and Barry Kripke. For secure streaming options, the episode is available on Max and Apple TV.

"The Big Bang Theory" The Toast Derivation (TV Episode 2011) Watch www xrysoi se The Big Bang Theory - S04E17