The Big Bang Theory Season 4
Air Date: Sep 23, 2010
Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.
Air Date: Sep 30, 2010
Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.
Air Date: Oct 7, 2010
The guys are concerned as Sheldon searches for an alternative to human companionship.
Air Date: Oct 14, 2010
An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
Air Date: Oct 21, 2010
Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.
Air Date: Oct 28, 2010
Leonard keeps an affair a secret from Sheldon, Howard and Raj.
Air Date: Nov 4, 2010
Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
Air Date: Nov 11, 2010
While the guys camp in line for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.
Air Date: Nov 18, 2010
Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
Air Date: Dec 9, 2010
Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
Air Date: Dec 16, 2010
The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.
Air Date: Jan 6, 2011
Leonard's idea for a smartphone app derails his friendship with Sheldon.
Air Date: Jan 20, 2011
Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz.
Air Date: Feb 3, 2011
Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.
Air Date: Feb 10, 2011
A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.
Air Date: Feb 17, 2011
As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
Air Date: Feb 24, 2011
Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.
Air Date: Mar 10, 2011
Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with…
Air Date: Mar 31, 2011
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…
Air Date: Apr 7, 2011
Sheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to even …
Air Date: Apr 28, 2011
When Leonard spends too much time in the shower with Priya, Sheldon charges Leonard with two violations of the roommate agreement. However, …
Air Date: May 5, 2011
Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
Air Date: May 12, 2011
When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.