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The Big Bang Theory S04E17

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The Big Bang Theory : The Toast Derivation

S04, E17 ()

Sheldon is upset when he realizes Leonard is the center of their group of friends.

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Previous Episode

The Cohabitation Formulation

S04, E16 (First Aired: February 17, 2011)

Wolowitz considers taking things with Bernadette to the next level; Leonard and Raj's sister rekindle their relationship.

Next Episode

The Prestidigitation Approximation

S04, E18 (First Aired: March 10, 2011)

Leonard has to choose between Penny and his new girlfriend, Priya; Howard's magic trick drives Sheldon crazy.