Watch The Big Bang Theory Online Season 4
Episode 1: The Robotic Manipulation
Howard uses a robotic arm for his own pleasure. Penny assists Sheldon with his first date.
Episode 2: The Cruciferous Vegetable Amplification
Sheldon calculates that he'll be dead before technology exists to download his consciousness into a robot, so he goes on a binge of healthy living and ultra-safety.
Episode 3: The Zazzy Substitution
The guys are concerned as Sheldon searches for an alternative to human companionship.
Episode 4: The Hot Troll Deviation
An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
Episode 5: The Desperation Emanation
Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.
Episode 6: The Irish Pub Formulation
Leonard keeps an affair secret from Sheldon, Howard and Raj.
Episode 7: The Apology Insufficiency
Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
Episode 8: The 21-second Excitation
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Episode 9: The Boyfriend Complexity
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
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
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
Leonard's idea for a smartphone app derails his friendship with Sheldon.
Episode 13: The Love Car Displacement
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
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
A 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
As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
Episode 17: The Toast Derivation
Sheldon struggles to cope when he realizes it's actually Leonard who is the center of their social group.
Episode 18: The Prestidigitation Approximation
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
When someone hacks Sheldon's online game account, the guys go on a quest to find the culprit.
Episode 20: The Herb Garden Germination
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
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Episode 22: The Wildebeest Implementation
Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
Episode 23: The Engagement Reaction
When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.
Episode 24: The Roomate Transmogrification
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.