The Big Bang Theory Episodes

2007, TV Show

The Big Bang Theory Season 4 episodes

The Wildebeest Implementation Season 4, Episode 22

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

The Roommate Transmogrification Season 4, Episode 24

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. read more

The Engagement Reaction Season 4, Episode 23

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

The Agreement Dissection Season 4, Episode 21

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

The Herb Garden Germination Season 4, Episode 20

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

The Zarnecki Incursion Season 4, Episode 19

The guys become sleuths to find out who hacked Sheldon's online-game account. read more

The Prestidigitation Approximation Season 4, Episode 18

Leonard has a tough choice to make when Priya asks him to stop spending time with Penny, forcing him to choose between the two women; and Howard keeps pestering Sheldon with a magic trick. read more

The Toast Derivation Season 4, Episode 17

Sheldon is in crisis when he realizes he's not the epicenter of the group, so, he decides to find new friends. read more

The Cohabitation Formulation Season 4, Episode 16

Howard contemplates a serious decision in his relationship with Bernadette; and Leonard and Raj's sister start seeing each other again. read more

The Benefactor Factor Season 4, Episode 15

Leonard has a moral crisis when he meets a wealthy widow who is willing to help the university. read more

The Thespian Catalyst Season 4, Episode 14

Sheldon wants acting lessons from Penny, hoping they will make him a better teacher. read more

The Love Car Displacement Season 4, Episode 13

Howard is jealous when Bernadette runs into her old boyfriend at a science event they're attending. read more

The Bus Pants Utilization Season 4, Episode 12

Leonard has a great idea for a smartphone app, and it causes friction with Sheldon. read more

The Justice League Recombination Season 4, Episode 11

The guys borrow Penny's new boyfriend when they enter a costume contest as members of the Justice League. read more

The Alien Parasite Hypothesis Season 4, Episode 10

Amy is attracted to Penny's ex-boyfriend; and Raj and Howard argue about which of them would be a better superhero. read more

The Boyfriend Complexity Season 4, Episode 9

Penny asks Leonard to lie to her visiting father (Keith Carradine), while Howard, Raj and Bernadette spend all night looking through a telescope. read more

The 21-Second Excitation Season 4, Episode 8

The guys camp out in a line hoping to see an anticipated movie, while Penny and Bernadette arrange Amy's first slumber party. Wil Wheaton has a cameo. read more

The Apology Insufficiency Season 4, Episode 7

Howard baffles Sheldon when he won't accept his apology; and an FBI agent (Eliza Dushku) interviews the guys for Howard's security clearance. read more

The Irish Pub Formulation Season 4, Episode 6

Raj's sister visits and inadvertently causes trouble for the friends. read more

The Desperation Emanation Season 4, Episode 5

Sheldon meets Amy's mother and comes to the realization that he no longer wants to see Amy; and Leonard realizes that everyone is in a relationship except for him. read more

The Hot Troll Deviation Season 4, Episode 4

Wolowitz is embarrassed when a secret of his is revealed; and Sheldon and Raj battle at work. read more

The Zazzy Substitution Season 4, Episode 3

Everyone worries for Sheldon, who begins searching for non-human companionship. read more

The Cruciferous Vegetable Amplification Season 4, Episode 2

Sheldon hatches a plan to extend his lifespan when he realises he won't be around to see the technology that will be able to download his consciousness into a robot. Steve Wozniak has a cameo. read more

The Robotic Manipulation Season 4, Episode 1

In the fourth-season opener, Sheldon goes on a date with Amy Fowler----his first date ever---and Penny finds herself accompanying them. read more

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Premiered: September 24, 2007, on CBS
Rating: TV-PG
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Premise: Two nerdy physicists share an apartment and an unlikely friendship with their beautiful neighbor with whom one of them is infatuated.

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