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 Amy gets sick, Sheldon tries to nurse her back to health; Wolowitz and his father-in-law plan a fishing trip.
When Sheldon is accused of sexual harassment, he ends up getting Raj, Leonard and Wolowitz in trouble too.
Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy.Watch Now:AmazoniTunes
As the guys don costumes and go on a road trip to a comic book convention, the ladies decide to stay home and try to interpret a comic book.
Raj and Howard try to to figure out why Sheldon disappears at 2:45 every afternoon; jealousy arises in Penny and Leonard's relationship.Watch Now:AmazoniTunes
The girls get involved when Leonard, Sheldon and Raj LL compete for tenure at the University.
Howard considers whether or not he should open a letter from his father when Sheldon cleans his closet; Penny and Leonard host a "grown-up" cocktail party.
Sheldon and Wolowitz's fight over a parking spot at the University impacts the whole gang.
Amy and Sheldon's relationship takes a surprising turn during a game of "Dungeons & Dragons;" Lucy and Koothrappali have an awkward date.
Leonard, Sheldon and Wolowitz talk to junior high girls about science-related careers; Raj plans a date with Lucy.Watch Now:AmazoniTunes
Sheldon faces a crisis of confidence when he is forced to work with his nemesis, Barry Kripke; Raj and Howard buy expensive action figures of themselves.Watch Now:iTunes
Amy feels threatened by Sheldon's new assistant; Wolowitz starts to feel the pressures of being in space.
When Leonard is considered for an exciting research opportunity, Sheldon becomes jealous and tries to scare him into backing out. Meanwhile, Raj's relationship with Lucy is strained when he tries to get her to meet his friends.
The guys search for a perfect Valentine's Day gift for their significant others; Stuart and Raj host a "lonely people" party at the comic book store.
After a bad date, Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.Watch Now:AmazoniTunes
Leonard and Sheldon hire the host of their favorite childhood TV show to perform for them; Bernadette and Howard run into trouble while dog-sitting for Raj's pet.
A fight between Sheldon and Leonard impacts Amy and Penny's living arrangements; while Howard is away, Raj helps Mrs. Wolowitz out.
Wolowitz's return from space isn't all he expected; game night becomes a gender war.
The gang heads to Stuart's comic book store to celebrate Halloween; Leonard uses science to seduce Penny.Watch Now:AmazoniTunes
During a game, Sheldon revisits Christmas memories; Amy, Penny and Bernadette look for a date for Koothrappali.Watch Now:AmazoniTunes
Bernadette wants Wolowitz to move out of his mom's house; Sheldon is caught in the middle of Amy and Wil Wheaton's argument.Watch Now:AmazoniTunes
A game threatens Sheldon's relationship with Stephen Hawking; Penny secretly signs up for a college class.
Sheldon tries to intervene when he learns that Penny is thinking about breaking up with Leonard; Howard is picked on during his space mission.Watch Now:iTunes
Raj faces his loneliness when his friends are out on dates. Also, while in space, Wolowitz gets drawn into a fight between Bernadette and his mom.Watch Now:iTunes
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