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- Season 4 overviewSep 23, 2010-May 19, 201124 episodesSeason 4 episodes1. The Robotic Manipulation Sep 23, 2010
- Penny tags along on Sheldon's first date; Wolowitz finds a new use for a robotic arm.
- 2. The Cruciferous Vegetable Amplification Sep 30, 2010
- Sheldon realizes he will not live long enough to download his consciousness into a robot body.
- 3. The Zazzy Substitution Oct 7, 2010
- When Sheldon searches for an alternative to human companionship, the guys become concerned.
- 4. The Hot Troll Deviation Oct 14, 2010
- An embarrassing secret of Wolowitz's is revealed; Raj and Sheldon get into a war at work.
- 5. The Desperation Emanation Oct 21, 2010
- Leonard realizes he is the only one in his group without a girlfriend.
- 6. The Irish Pub Formulation Oct 28, 2010
- Leonard keeps an affair a secret from Sheldon, Howard and Raj.
- 7. The Apology Insufficiency Nov 4, 2010
- Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance.
- 8. The 21-Second Excitation Nov 11, 2010
- The guys camp out for a movie screening; Penny and Bernadette invite Amy to her first slumber party.
- 9. The Boyfriend Complexity Nov 18, 2010
- Penny asks Leonard to lie to her father; an all-nighter at a telescope.
- 10. The Alien Parasite Hypothesis Dec 9, 2010
- Koothrappali and Wolowitz try to prove who would be a better superhero.
- 11. The Justice League Recombination Dec 16, 2010
- The guys try to bond with Penny's new boyfriend through a costume contest.
- 12. The Bus Pants Utilization Jan 6, 2011
- Leonard's idea for a smartphone application causes friction in his friendship with Sheldon.
- 13. The Love Car Displacement Jan 20, 2011
- Bernadette runs into her ex-boyfriend (Rick Fox) while attending a science event with Wolowitz.
- 14. The Thespian Catalyst Feb 3, 2011
- Sheldon takes acting lessons from Penny in hope of becoming a better teacher.
- 15. The Benefactor Factor Feb 10, 2011
- A wealthy donor makes Leonard question what he is willing to do for science.
- 16. The Cohabitation Formulation Feb 17, 2011
- Wolowitz considers taking things with Bernadette to the next level.
- 17. The Toast Derivation Feb 24, 2011
- Sheldon is upset when he realizes Leonard is the center of their group of friends.
- 18. The Prestidigitation Approximation Mar 10, 2011
- Leonard must choose between Penny and his new girlfriend, Priya.
- 19. The Zarnecki Incursion Mar 31, 2011
- The guys try to figure out who hacked Sheldon's online-game account.
- 20. The Herb Garden Germination Apr 7, 2011
- Howard decides to take a big step in his relationship with Bernadette.
- 21. The Agreement Dissection Apr 28, 2011
- Priya dissects the roommate agreement; the ladies take Sheldon dancing.
- 22. The Wildebeest Implementation May 5, 2011
- Raj tries to cure his social anxiety; Penny spies on Leonard and his girlfriend through Bernadette.
- 23. The Engagement Reaction May 12, 2011
- Howard's mom winds up in the hospital after hearing news of her son's engagement to Bernadette.
- 24. The Roommate Transmogrification May 19, 2011
- Bernadette gets her Ph.D., inspiring the guys to tease Wolowitz about his lack of a doctorate.
The fourth season of the American television sitcom The Big Bang Theory aired on CBS from September 23, 2010 to May 19, 2011. [1] Melissa Rauch and Mayim Bialik auditioned and were promoted to the main cast during this season as Dr. Bernadette Rostenkowski and Dr. Amy Farrah Fowler respectively.
Bernadette and Wolowitz leave their kids for the first time; Penny and Leonard try to keep a secret; Sheldon and Amy stick together; and Koothrappali makes a new friend, as the gang travels together into an uncharted future. 9.5/10. Rate. Top-rated.
Find out the cast, episodes, and plot summary of season 4 of the popular sitcom The Big Bang Theory. See how Sheldon, Leonard, Penny, and the gang deal with relationships, careers, and geeky adventures.
Watch The Big Bang Theory — Season 4 with a subscription on Max, or buy it on Fandango at Home, Prime Video, Apple TV. Mayim Bialik adds welcome balance and wit to the cast of Big...
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- September 24, 2007
- Johnny Galecki
- The Robotic Manipulation. 7.6. September 23, 2010 • 21m. Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm. Read More.
- The Cruciferous Vegetable Amplification. 7.6. September 30, 2010 • 21m. Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.
- The Zazzy Substitution. 7.2. October 7, 2010 • 22m. The guys are concerned as Sheldon searches for an alternative to human companionship. Read More. Expand.
- The Hot Troll Deviation. 7.4. October 14, 2010 • 20m. An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
Watch all 24 episodes of the fourth season of the hit comedy series about physicists and best friends Leonard and Sheldon. Subscribe to Max for $9.99/month or buy individual episodes or the season on Prime Video.
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Watch the fourth season of the popular comedy series about two nerdy physicists and their friends. See how they deal with love, work, and life in 24 episodes, some of which are unavailable in your location.