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Watch The Big Bang Theory Season 4 English Online Free

6.9 Rated 6.9/10 (921 votes)

Watch The Big Bang Theory S4E1 in English Online Free | HD
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WATCH 4.9

The Robotic Manipulationclose

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

Watch The Big Bang Theory S4E2 in English Online Free | HD
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WATCH 7.2

The Cruciferous Vegetable Amplificationclose

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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WATCH 6.5

The Zazzy Substitutionclose

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

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WATCH 7.3

The Hot Troll Deviationclose

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

Watch The Big Bang Theory S4E5 in English Online Free | HD
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WATCH 6.5

The Desperation Emanationclose

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

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WATCH 7.3

The Irish Pub Formulationclose

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

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WATCH 6.5

The Apology Insufficiencyclose

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

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WATCH 6.7

The 21-second Excitationclose

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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WATCH 6.7

The Boyfriend Complexityclose

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

Watch The Big Bang Theory S4E10 in English Online Free | HD
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WATCH 7.9

The Alien Parasite Hypothesisclose

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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WATCH 7.2

The Justice League Recombinationclose

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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WATCH 6.7

The Bus Pants Utilizationclose

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

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WATCH 7.5

The Love Car Displacementclose

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

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WATCH 6

The Thespian Catalystclose

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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WATCH 6.7

The Benefactor Factorclose

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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WATCH 5.7

The Cohabitation Formulationclose

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

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WATCH 7.5

The Toast Derivationclose

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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WATCH 7.5

The Prestidigitation Approximationclose

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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WATCH 7

The Zarnecki Incursionclose

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 Howard discovers who hacked the account, the guys depart for a quest to Carlsbad, California where the hacker, Todd Zarnecki, lives in order to retrieve the stolen account, along with "enchanted weapons, gladiator armor, gold, and a battle ostrich, Glenn". Despite Sheldon carrying his Bat'leth with him they fail miserably. On the way back their car engine breaks down, and they're saved by Penny, who came to drive them home and upon hearing about their failure promises to show them "How we finish quests in Nebraska" and forces Zarnecki to give up kicking him below waist.

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WATCH 6.8

The Herb Garden Germinationclose

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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WATCH 7.8

The Agreement Dissectionclose

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 lawyer to nullify the charges due to the agreement's vague wording, much to Sheldon's dismay. When the guys take advantage of Priya's skills in order to eat Greek food on pizza night, Sheldon goes to Penny, who invites him to a girls' night out with Amy and Bernadette, which Sheldon agrees to after Penny mentions that they may be talking trash about Priya. After the girls drink some cocktails, they decide to take Sheldon dancing, which Sheldon reluctantly goes along with. After dancing, Sheldon takes an intoxicated Amy back to her apartment and as well as talking about Priya, meets a monkey who is addicted to smoking cigarettes. Amy tells Sheldon not to give in to Priya's law skills, before kissing him and going to her bathroom to vomit.

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WATCH 5.8

The Wildebeest Implementationclose

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

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WATCH 6.3

The Engagement Reactionclose

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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WATCH 7.5

The Roommate Transmogrificationclose

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

Watch The Big Bang Theory (2007) in English Online Free | 720p BrRip x264

Seasons

Watch The Big Bang Theory Season 1 in English Online Free Season 1
(17 Episodes)
2007-09-24
Watch The Big Bang Theory Season 2 in English Online Free Season 2
(23 Episodes)
2008-09-22
Watch The Big Bang Theory Season 3 in English Online Free Season 3
(23 Episodes)
2009-09-21
Watch The Big Bang Theory Season 4 in English Online Free Season 4
(24 Episodes)
2010-09-23
Watch The Big Bang Theory Season 5 in English Online Free Season 5
(24 Episodes)
2011-09-22
Watch The Big Bang Theory Season 6 in English Online Free Season 6
(24 Episodes)
2012-09-27
Watch The Big Bang Theory Season 7 in English Online Free Season 7
(24 Episodes)
2013-09-25
Watch The Big Bang Theory Season 8 in English Online Free Season 8
(24 Episodes)
2015-01-05
Watch The Big Bang Theory Season 9 in English Online Free Season 9
(24 Episodes)
2015-09-21
Watch The Big Bang Theory Season 10 in English Online Free Season 10
(13 Episodes)
2016-09-19