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On the seventh season premiere, Sheldon and Penny bond in Leonard's absence, but it's Sheldon's feelings that are crushed when Leonard returns from the North Sea.

Raj gets consoled about his ex-girlfriend and Howard's relationship with his mother causes an unusual threat to his masculinity in the second half of the season seven premiere.

The entire gang competes in a cutthroat scavenger hunt.

After Amy ruins one of Sheldon's favorite movies, Raiders of the Lost Ark, he gets defensive, seeking revenge. Meanwhile, Leonard discovers a way to get Penny to do anything

Sheldon must decide how much "Amy time" is too much after she takes a job at his university. Meanwhile, Howard finds himself sleeping on Raj's couch after a fight with Bernadette

Sheldon's latest scientific breakthrough makes him feel like a fraud. Meanwhile, Howard's romantic gesture to Bernadette causes Penny to step up her game with Leonard.

Sheldon feels slighted when Professor Proton (BOB NEWHART) seeks advice from Leonard instead of him, and he seeks revenge by befriending a rival science TV host, BILL NYE.

Sheldon punishes Leonard for a past mistake by making him "walk a mile in his shoes." Meanwhile, Penny confronts Raj's ex-girlfriend, Lucy (guest star KATE MICUCCI).

The gang decides to spend Thanksgiving with Mrs. Wolowitz.

Sheldon faces a crisis after Leonard disproves his accidental scientific discovery. Meanwhile, Raj must stay with Howard & Bernadette for a week.

While Sheldon is away in Texas, everyone gathers to decorate the apartment Christmas tree, and they each realize how much he has changed their lives.

When Penny's big acting break on NCIS is a bust, Leonard struggles to help her, which results in Penny asking Leonard a bold relationship question.

After Penny quits her job and Sheldon is forced to take another vacation, the two spend a lot of time together.

After they miss out on Comic-Con tickets, the guys mock Sheldon for trying to hold his own comic book convention...until he winds up spending a wild night with JAMES EARL JONES.

Love is in the air when Amy convinces Sheldon to join her (as well as Howard and Bernadette) for a romantic weekend in Napa Valley to celebrate Valentine's Day.

Leonard's purchase of a dining room table for the apartment nearly causes Sheldon to break up with Amy, while Howard is offered a chance to return to space again.

Howard invites Sheldon to travel to Houston with him in an attempt to improve their friendship, while Penny's offered an embarrassing role and Raj asks Amy for help with a girl.

Sheldon gets quite a surprise when he visits his mom in Houston, while Raj's "Murder Mystery" party causes tension within the gang.

While Penny and Raj face difficult life decisions, Amy helps Sheldon through the even greater hell of choosing a new gaming system.

Penny helps Sheldon cope after he "breaks up" with String Theory. Meanwhile, Howard and Bernadette go on a double date with Raj and Emily.

When Sheldon tries to be spontaneous on "Anything Can Happen Thursday," it leads to unexpected friction between Penny, Amy and Bernadette.

Professor Proton returns on "Star Wars Day" to offer guidance for Sheldon, while Leonard turns a relationship milestone into a competition with Penny.

A horrible day at work prompts Penny to evaluate her life choices - including her relationship with Leonard. Meanwhile, Howard and Bernadette struggle to care for Mrs. Wolowitz.

With his entire world changing around him, Sheldon is forced to confront an uncertain future and considers a major move in the seventh season finale.