A woman who moves into an apartment across the hall from two brilliant but socially awkward physicists shows them how little they know about life outside of the laboratory.
When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap apartments and Penny does something she regrets.
Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.
Sheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to an even higher level.Watch Now:AmazoniTunes
The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.Watch Now:AmazoniTunes
Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.
When Priya finds a loophole in the roommate agreement to throw Sheldon out for the night, Penny, Amy and Bernadette take him to a nightclub.
The guys go all out to help Sheldon find the person responsible for hacking his online gaming account, while the girls' hatred for Priya increases.
Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.
When the gang road trips to a conference, tensions run high when Bernadette runs into her ex-boyfriend.
Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.
Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.
A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.
While the guys camp in line for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.
As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister Priya.
Leonard keeps a romantic affair a secret from Sheldon, Howard and Raj.
Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.Watch Now:iTunes
The guys are concerned as Sheldon searches for an alternative to human companionship.
An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.
Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.
Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
Leonard's idea for a smartphone app derails his friendship with Sheldon.
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