The Big Bang Theory

2007•12 series•Entertainment / Comedy

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Mensa-fied best friends and roommates Leonard and Sheldon, physicists who work at the California Institute of Technology, may be able to tell everybody more than they want to know about quantum physics, but getting through most basic social situations, especially ones involving women, totally baffles them. How lucky, then, that babe-alicious waitress/aspiring actress Penny moves in next door. Frequently seen hanging out with Leonard and Sheldon are friends and fellow Caltech scientists Wolowitz and Koothrappali. Will worlds collide? Does Einstein theorize in the woods?

Episode 1The Robotic Manipulation

Penny tags along on Sheldon's first date. Howard finds a new use for a robotic arm (S4 Ep1)

Episode 2The Cruciferous Vegetable Amplification

Sheldon realises he won't live long enough to get a robot body (S4 Ep2)

Episode 3The Zazzy Substitution

Sheldon starts bulk-buying cats after breaking up with Amy (S4 Ep3)

Episode 4The Hot Troll Deviation

An embarrassing secret comes to light as Howard tries to win back Bernadette (S4 Ep4)

Episode 5The Desperation Emanation

Leonard realises that he's the only one of the gang without a girlfriend (S4 Ep5)

Episode 6The Irish Pub Formulation

A visit from Raj's sister Priya creates tension among the guys (S4 Ep6)

Episode 7The Apology Insufficiency

Leonard vows to be more confident around women. Howard gets a call from the FBI (S4 Ep7)

Episode 8The 21-Second Excitation

Sheldon's movie-going plans are scuppered by his nemesis Wil Wheaton (S4 Ep8)

Episode 9The Boyfriend Complexity

Leonard discovers that Penny's parents still think that he and Penny are a couple (S4 Ep9)

Episode 10The Alien Parasite Hypothesis

Amy discovers that she has feelings for Penny's ex-boyfriend Zack (S4 Ep10)

Episode 11The Justice League Recombination

The guys warm to Penny's new boyfriend Zack (S4 Ep11)

Episode 12The Bus Pants Utilization

Leonard and Sheldon battle for control of an idea for an app (S4 Ep12)

Episode 13The Love Car Displacement

Howard feels threatened when Bernadette runs into her ex at a conference (S4 Ep13)

Episode 14The Thespian Catalyst

Sheldon lectures, but worries that the students don't seem to like him (S4 Ep14)

Episode 15The Benefactor Factor

A wealthy benefactor makes Leonard ponder how far he's willing to go for science (S4 Ep15)

Episode 16The Cohabitation Formulation

Howard is torn between Bernadette and his mother (S4 Ep16)

Episode 17The Toast Derivation

Sheldon realises it is not him, but Leonard who is the centre of their social group (S4 Ep17)

Episode 18The Prestidigitation Approximation

Leonard must choose between Priya and Penny (S4 Ep18)

Episode 19The Zarnecki Incursion

When Sheldon's online gaming account is hacked, the guys go on a quest for justice (S4 Ep19)

Episode 20The Herb Garden Germination

Sheldon and Amy experiment on their friends by spreading gossip (S4 Ep20)

Episode 21The Agreement Dissection

Priya uses her legal nous to dissect the roommate agreement (S4 Ep21)

Episode 22The Wildebeest Implementation

Raj attempts to cure his social anxiety disorder around talking to women (S4 Ep22)

Episode 23The Engagement Reaction

Howard finally tells him mum that he's engaged to Bernadette (S4 Ep23)

Episode 24The Roommate Transmogrification

Raj moves in with Sheldon after Leonard and Priya's Trekkie bedroom antics (S4 Ep24)

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