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The Big Bang Theory Season 4 Episode 24 “The Roommate Transmogrification”

In the fourth-season finale, Raj moves in with Sheldon when Leonard and Priya’s “Star Trek” bedroom fantasy is too much for him; and the guys tease Howard when Bernadette gets her PhD, making Howard the only one without a doctorate

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The Big Bang Theory Season 4 Episode 23 “The Engagement Reaction”

Howard finally tells his mother that he’s marrying Bernadette, and the news puts her in the hospital.

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The Big Bang Theory Season 4 Episode 22 “The Wildebeest Implementation”

Raj makes an attempt to cure his phobia of talking to women; and Penny spies on Leonard and Priya with the help of Bernadette.

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The Big Bang Theory Season 4 Episode 21 “The Agreement Dissection”

Priya uses her legal expertise to rip apart Sheldon’s roommate agreement, and the women take the flustered Sheldon out dancing

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The Big Bang Theory Season 4 Episode 20 “The Herb Garden Germination”

Sheldon and Amy spread gossip as part of an experiment; and Howard and Bernadette’s relationship gets serious. Physicist Brian Greene has a cameo

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The Big Bang Theory Season 4 Episode 19 “The Zarnecki Incursion”

The guys become sleuths to find out who hacked Sheldon’s online-game account

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The Big Bang Theory Season 4 Episode 18 “The Prestidigitation Approximation”

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

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The Big Bang Theory Season 4 Episode 17 “The Toast Derivation”

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

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The Big Bang Theory Season 4 Episode 16 “The Cohabitation Formulation”

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

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The Big Bang Theory Season 4 Episode 15 “The Benefactor Factor”

A wealthy donor makes Leonard question what he is willing to do for science.