Episode 1 | The Robotic Manipulation

Penny ends up tagging along on Sheldon's first ever date with Amy, while Howard finds an unusual use for a robotic arm.

Episode 2 | The Cruciferous Vegetable Amplification

When Sheldon calculates the technology to download his consciousness into a robot won't be invented soon enough, he desperately tries to find a way to increase his lifespan.

Episode 3 | The Zazzy Substitution

Following his 'breakup' with Amy, the gang become concerned with Sheldon's obsessive search for non-human companionship and call his mother to intervene.

Episode 4 | The Hot Troll Deviation

Howard tries to get Penny's help in winning back Bernadette, but first has to confess the embarrassing reason why they broke up in the first place. Raj and Sheldon clash over a desk.

Episode 5 | The Desperation Emanation

Sheldon is scared that he is in a relationship when Amy asks him to meet her mother, and Leonard asks Howard and Bernadette to set him up because he is the only person in the group without a girlfriend.

Episode 6 | The Irish Pub Formulation

Leonard tries to keep everyone from finding out that he spent the night with Raj's sister, but Sheldon finds out and concocts an elaborate story to help him keep the secret from Raj.

Episode 7 | The Apology Insufficiency

An FBI agent interviews the guys when Howard needs to obtain a security clearance.

Episode 8 | The 21-Second Excitation

The guys camp out all night waiting to see an extended cut of Indiana Jones, while Amy joins in on girls' night with Penny and Bernadette.

Episode 9 | The Boyfriend Complexity

Penny asks Leonard to pose as her boyfriend when her father visits. Howard, Raj and Bernadette have an awkward encounter when they spend the evening together.

Episode 10 | The Alien Parasite Hypothesis

Amy finds she has sexual feelings for Penny's ex-boyfriend Zack, while Raj and Howard try to prove who would be the better superhero.

Episode 11 | The Justice League Recombination

The guys enter a costume contest as members of the Justice League and convince Penny and Zack to join them.

Episode 12 | The Bus Pants Utilization

Leonard has an idea for a new smartphone app and asks the guys for help, however Sheldon tries to take over the project, and Leonard fires him.

Episode 13 | The Love Car Displacement

Chaos ensues when the gang spend the weekend together at a science convention.

Episode 14 | The Thespian Catalyst

To improve his skills as an instructor, Sheldon asks Penny to give him acting lessons. Meanwhile, Raj begins having impure fantasies about Bernadette.

Episode 15 | The Benefactor Factor

To secure needed funding for the university, Sheldon convinces Leonard to get friendly with a wealthy benefactor.

Episode 16 | The Cohabitation Formulation

Bernadette makes Howard choose between herself and his mother, while Penny and Raj become upset when Priya returns to town and resumes her relationship with Leonard.

Episode 17 | The Toast Derivation

Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.

Episode 18 | The Prestidigitation Approximation

Priya forces Leonard to choose between a relationship with her or a friendship with Penny. A magic trick by Howard has Sheldon fooled.

Episode 19 | The Zarnecki Incursion

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.

Episode 20 | The Herb Garden Germination

Sheldon and Amy secretly experiment on the gang by spreading rumors when they hear that Bernadette is thinking about breaking up with Howard.

Episode 21 | The Agreement Dissection

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.

Episode 22 | The Wildebeest Implementation

Sheldon invents a three-player chess game, Penny and Amy use Bernadette to spy on Leonard and Priya, and Raj tries a new drug to treat his social anxiety.

Episode 23 | The Engagement Reaction

Howard believes that his mom suffered a heart attack because he told her that he's marrying Bernadette, Sheldon freaks out over germs, and Penny and Priya compare notes on Leonard.

Episode 24 | The Roommate Transmogrification

Raj moves in with Sheldon after hearing Leonard and Priya engage in a Star Trek fantasy in his apartment. Bernadette receives her doctorate.