Sheldon and Amy have their first fight since moving in together, and Koothrappali is shocked at the realities of financial independence when he stops receiving support from his father.

Tensions rise when the boys struggle to complete their government project on time and Sheldon tries an energy drink to stay awake. Also, Penny and Amy go to a “party”…

Wolowitz questions his engineering abilities when he and Sheldon can’t get a toy drone to fly. Meanwhile, a cancelled flight nearly prevents Leonard from giving the commencement address at his…

Leonard and Howard turn to Raj for help in dealing with a work emergency when they nearly come to blows after blaming each other for a potential disaster at the…

Penny buys Leonard and Sheldon “Star Trek” collectibles as a thank-you, leading Sheldon to be haunted by Mr. Spock. Meanwhile, Raj decides he has met the “Future Mrs. Koothrappali” after…

Penny plays Matchmaker for Raj, which results in him finding a girl he is comfortable talking to.

A fight between Sheldon and Penny leaves Amy caught in the middle, while Leonard tries to spice up his long-distance relationship with Priya.

When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she’s regrets.

Sheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to even higher level.

A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.

The guys’ plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.

Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.

Raj’s parents set him up on a blind date, but just when he discovers he can talk to her, she shows interest in Sheldon.

It’s 2417, and the Planetary Union promotes Ed Mercer to Captain of the exploratory vessel The U.S.S. Orville. Ed’s enthusiasm for his new position is dampened when his ex-wife, Kelly…