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Georgie discovers that Jim's annual tire convention trip isn't what he says it is. Meanwhile, Mandy has doubts about the strength of her marriage.

Audrey and Mary go to war over CeeCee and Georgie, and Mandy can't help but take sides.

A disappointing loss at the science fair sparks an existential crisis and sends Sheldon's life in a new direction.

When Sheldon is bullied by an unlikely character, Mary and George disagree on how to handle the situation.

When Mary bans Sheldon from reading a mature comic book, Sheldon decides it's time to assert his independence from his mother.

When Sheldon is no longer academically challenged at Medford High, he audits a college class taught by a professor.

Leonard is aghast to find out that Penny believes in psychics. Sheldon tries to assist Koothrappali in picking up a girl at a university party.

A robbery of their apartment sees Leonard and Sheldon call on their friends to devise a security system.

Stuck on the solution to a physics problem, Sheldon tries different methods to change his thinking, including working at The Cheesecake Factory.

When Leonard is offered a trip to Switzerland on Valentine's Day to see a particle accelerator, he must choose between taking Penny or Sheldon.

An appearance in traffic court comes at the worst possible time for Sheldon, the same day Stan Lee is appearing at the comic book store.

The guys go to a garage sale and find a ring from the Lord of the Rings films, and the rare find threatens their friendship.

Sheldon's fear of speaking in front of large groups threatens his ability to accept an award, so the gang tries to help him prepare for the big night.

Sheldon squares off at the bowling alley against nemesis Wil Wheaton. Leonard's miffed over Penny's response when he says, 'I love you.

Audrey's past rears its head when Georgie leaves the tire store to work for Fred Fagenbacher, Jim's longtime nemesis.

Georgie worries he's letting his family down when he's forced to stay home ill, and Mandy worries about how her career will affect her marriage.

A heated argument erupts between the Coopers and their neighbours when a new dog terrorises Sheldon.

While Sheldon is obsesses over Meemaw's budding relationship with his mentor, Dr. Sturgis, George and Mary attempt to bond with their other kids.

When Meemaw is pursued by two gentlemen callers, Sheldon interferes, forcing her to set some ground rules.

Sheldon dismantles the refrigerator to stop an annoying hum and then must get a paper route to pay for the repairs.

Following Leonard and Penny's break up, Sheldon tries to hide from Leonard and the gang that he had a friendly spaghetti dinner at Penny's.

Sheldon hosts a visiting female physicist, but her intelligence seems matched by her libido.

A squabble over the thermostat setting leads to Leonard going over to Penny's and recounting the story of how he met and moved in with Sheldon.

Howard and Raj set Sheldon up on an Internet dating site. Penny discovers that she can't go back to dating dumb jocks after dating Leonard.

Howard uses a robotic arm for his own pleasure. Sheldon goes on a date with Amy Farrah Fowler, and Penny finds herself accompanying them.

Sheldon calculates that he'll be dead before technology exists to download his consciousness into a robot, so he goes on a healthy-living binge.

Sheldon breaks up with Amy Farrah Fowler, and the guys worry when he starts replacing her with cats.

Wolowitz is embarrassed when a secret of his is revealed, and Sheldon and Raj battle at work.

Dara Ó Briain serves up more comedic aces with the help of guests Rhys James, Hugh Dennis, Sara Pascoe, Scott Bennett, Michelle Wolf and Glenn Moore.

After two top figure skaters' glittering rivalry gets them banned from the sport, they're forced to team up as a pair to get back into competition.