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The Big Bang Theory season 4

←The Big Bang Theory season 3 The Big Bang Theory season 5→
The Big Bang Theory season 4 poster
24 episodes (4020 views)
Air weekdate:Thursday
Cast:Jim Parsons, Johnny Galecki, Kaley Cuoco, Kunal Nayyar, Simon Helberg, Melissa Rauch, Mayim Bialik, Laura Spencer, Sara Gilbert, Kevin Sussman, John Ross Bowie, Carol Ann Susi
8.8/10(41886 votes)

Penny dates a couple of guys including the dense Zack who likes the “science dudes”, Sheldon begins a platonic relationship with Amy, Howard reconnects with Bernadette eventually asking her to marry him, Leonard begins to date Raj’s sister Priya, Penny becomes friends with Amy and expresses regret at breaking up with Leonard.

The Big Bang Theory season 4 episodes list:

Episode #1: The Robotic Manipulation (air date: 2010-09-23)

Penny finds herself along for the ride on Sheldon's first date ever; while Wolowitz finds a new use for a robotic arm.

Episode #2: The Cruciferous Vegetable Amplification (air date: 2010-09-30)

Sheldon realizes he won't live long enough to download his consciousness into a robot body, and attempts to extend his lifespan.

Episode #3: The Zazzy Substitution (air date: 2010-10-07)

The guys are concerned as Sheldon searches for an alternative to human companionship.

Episode #4: The Hot Troll Deviation (air date: 2010-10-14)

An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.

Episode #5: The Desperation Emanation (air date: 2010-10-21)

Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.

Episode #6: The Irish Pub Formulation (air date: 2010-10-28)

Leonard keeps an affair secret from Sheldon, Howard and Raj.

Episode #7: The Apology Insufficiency (air date: 2010-11-04)

Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.

Episode #8: The 21-Second Excitation (air date: 2010-11-11)

While the guys camp in line for a screening, Penny and Bernadette invite Amy to her first slumber party.

Episode #9: The Boyfriend Complexity (air date: 2010-11-18)

Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.

Episode #10: The Alien Parasite Hypothesis (air date: 2010-12-09)

Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.

Episode #11: The Justice League Recombination (air date: 2010-12-16)

The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.

Episode #12: The Bus Pants Utilization (air date: 2011-01-06)

Leonard's idea for a smartphone app derails his friendship with Sheldon.

Episode #13: The Love Car Displacement (air date: 2011-01-20)

Tension runs high when everyone is staying at the same hotel for a science event and Bernadette runs into her ex-boyfriend.

Episode #14: The Thespian Catalyst (air date: 2011-02-03)

Sheldon hopes acting lessons from Penny will help him become a better teacher. Meanwhile, Koothrappali fantasizes about his best friend's girlfriend.

Episode #15: The Benefactor Factor (air date: 2011-02-10)

Wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.

Episode #16: The Cohabitation Formulation (air date: 2011-02-17)

As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.

Episode #17: The Toast Derivation (air date: 2011-02-24)

Sheldon struggles to cope when he realizes it's actually Leonard who is the center of their social group.

Episode #18: The Prestidigitation Approximation (air date: 2011-03-10)

Leonard must choose between new girlfriend Priya and his friendship with Penny. Meanwhile, Howard drives Sheldon crazy with a magic trick.

Episode #19: The Zarnecki Incursion (air date: 2011-03-31)

When someone hacks Sheldon's online game account, the guys go on a quest to find the culprit.

Episode #20: The Herb Garden Germination (air date: 2011-04-07)

Sheldon and Amy experiment on their friends by spreading gossip, while Howard takes a big step in his relationship with Bernadette.

Episode #21: The Agreement Dissection (air date: 2011-04-28)

When Priya uses her lawyer skills to pick apart the roommate agreement, the girls take Sheldon dancing.

Episode #22: The Wildebeest Implementation (air date: 2011-05-05)

Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.

Episode #23: The Engagement Reaction (air date: 2011-05-12)

When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.

Episode #24: The Roommate Transmogrification (air date: 2011-05-19)

When Bernadette receives her Ph.D., the guys take joy in reminding an emasculated Wolowitz that he is the only one in their group who isn't a doctor. Meanwhile, Koothrappali becomes Sheldon's new roommate after hearing Leonard and Priya engaging in a "Star Trek" bedroom fantasy.

The Big Bang Theory season 4 promo

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