Watch The Big Bang Theory Season 4 online
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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.
Episodes
1. The Robotic Manipulation
Penny finds herself along for the ride on Sheldon's first date ever; while Wolowitz finds a new use for a robotic arm.
2. The Cruciferous Vegetable Amplification
Sheldon realizes he won't live long enough to download his consciousness into a robot body, and attempts to extend his lifespan.
3. The Zazzy Substitution
The guys are concerned as Sheldon searches for an alternative to human companionship.
4. The Hot Troll Deviation
An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
5. The Desperation Emanation
Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.
6. The Irish Pub Formulation
Leonard keeps an affair secret from Sheldon, Howard and Raj.
7. The Apology Insufficiency
Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
8. The 21-Second Excitation
While the guys camp in line for a screening, Penny and Bernadette invite Amy to her first slumber party.
9. The Boyfriend Complexity
Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
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.
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.
12. The Bus Pants Utilization
Leonard's idea for a smartphone app derails his friendship with Sheldon.
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.
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.
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.
16. The Cohabitation Formulation
As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
17. The Toast Derivation
Sheldon struggles to cope when he realizes it's actually Leonard who is the center of their social group.
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.
19. The Zarnecki Incursion
When someone hacks Sheldon's online game account, the guys go on a quest to find the culprit.
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.
21. The Agreement Dissection
When Priya uses her lawyer skills to pick apart the roommate agreement, the girls take Sheldon dancing.
22. The Wildebeest Implementation
Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
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.
24. The Roommate 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.