Watch The Big Bang Theory Online

TV-14 CBS 22m 2006 8.3

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The Big Bang Theory

A woman who moves into an apartment across the hall from two brilliant but socially awkward physicists shows them how little they know about life outside of the laboratory.


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The Big Bang Theory Full Episodes

S4 E1: The Robotic Manipulation

Aired: September 23rd, 2010 @ 7:00 PM CST

Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.


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S4 E2: The Cruciferous Vegetable Amplification

Aired: September 30th, 2010 @ 7:00 PM CST

Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.


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S4 E3: The Zazzy Substitution

Aired: October 7th, 2010 @ 7:00 PM CST

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


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S4 E4: The Hot Troll Deviation

Aired: October 14th, 2010 @ 7:00 PM CST

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


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S4 E5: The Desperation Emanation

Aired: October 21st, 2010 @ 7:00 PM CST

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


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S4 E6: The Irish Pub Formulation

Aired: October 28th, 2010 @ 7:00 PM CST

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


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S4 E7: The Apology Insufficiency

Aired: November 4th, 2010 @ 7:00 PM CST

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


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S4 E8: The 21-Second Excitation

Aired: November 11th, 2010 @ 7:00 PM CST

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


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S4 E9: The Boyfriend Complexity

Aired: November 18th, 2010 @ 7:00 PM CST

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


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S4 E10: The Alien Parasite Hypothesis

Aired: December 9th, 2010 @ 7:00 PM CST

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


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S4 E11: The Justice League Recombination

Aired: December 16th, 2010 @ 7:00 PM CST

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


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S4 E12: The Bus Pants Utilization

Aired: January 6th, 2011 @ 7:00 PM CST

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


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S4 E13: The Love Car Displacement

Aired: January 20th, 2011 @ 7:00 PM CST

Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz.


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S4 E14: The Thespian Catalyst

Aired: February 3rd, 2011 @ 7:00 PM CST

Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.


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S4 E15: The Benefactor Factor

Aired: February 10th, 2011 @ 7:00 PM CST

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


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S4 E16: The Cohabitation Formulation

Aired: February 17th, 2011 @ 7:00 PM CST

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


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S4 E17: The Toast Derivation

Aired: February 24th, 2011 @ 7:00 PM CST

Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.


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S4 E18: The Prestidigitation Approximation

Aired: March 10th, 2011 @ 7:00 PM CST

Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.


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S4 E19: The Zarnecki Incursion

Aired: March 31st, 2011 @ 7:00 PM CST

Sheldon's World of Warcraft online game account is hacked and he is determined to find out who did it. Also Penny shares some girl talk with her friends about Leonard and his new girlfriend. When...


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S4 E20: The Herb Garden Germination

Aired: April 7th, 2011 @ 7:00 PM CST

Sheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to even higher level.


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S4 E21: The Agreement Dissection

Aired: April 28th, 2011 @ 7:00 PM CST

When Leonard spends too much time in the shower with Priya, Sheldon charges Leonard with two violations of the roommate agreement. However, before he can get too far, Priya uses her skills as a...


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S4 E22: The Wildebeest Implementation

Aired: May 5th, 2011 @ 7:00 PM CST

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


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S4 E23: The Engagement Reaction

Aired: May 12th, 2011 @ 7:00 PM CST

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


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S4 E24: The Roommate Transmogrification

Aired: May 19th, 2011 @ 7:00 PM CST

When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.


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