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Sheldon fakes being sick to avoid a swim test at school; Dr. Sturgis spies on Meemaw's new boyfriend.

Sheldon starts an internet flame war; Missy stands up to the boys on her baseball team; Meemaw is unhappy when George Sr. spends time with her new boyfriend.

Joey auditions for a big role which will require him to appear naked; Rachel and Phoebe plan Monica's bridal shower; Ross and Monica's attractive cousin visits and stirs the passions of all men who meet her.

A college friend with whom Rachel shared an embarrassing and passionate moment shows up at Central Perk; Chandler and Ross argue for possession of Val Kilmer's tuxedo; Joey drives Monica crazy over the wedding schedule.

With only four weeks until their wedding, Monica and Chandler try to write their vows; Chandler enlists the boys' help, while Monica does the same with the girls.

Trying to ensure an ideal wedding, Monica arranges a meeting so Chandler and his estranged father can reconcile.

On the eve of the wedding, Ross searches for missing Chandler, who has doubts, while the girls distract unsuspecting Monica.

Ross tries to find Chandler with Phoebe's help; Rachel tries to hinder Monica.

The reception following Monica and Chandler's wedding is almost upstaged by the news that a member of the group might be pregnant.

The gals speculate about the father of Rachel's baby, the guys scramble after Chandler loses the film from his wedding.

The real father of Rachel's baby is revealed; Monica and Chandler struggle to make their honeymoon flight.

Ross and Rachel argue over how they ended up in bed together weeks earlier, so Ross announces he has the encounter on tape.

Ross is horrified when Rachel goes on a date with a soap-opera star (Johnny Messner); Phoebe is attracted to a clumsy chef whom Monica wants to fire.

At Monica's Halloween party, Phoebe meets her twin sister's fiancé and finds that she is attracted to him.

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.

Leonard and Sheldon hire the host (Bob Newhart) of their favorite childhood TV show to perform; Bernadette and Howard run into trouble while dog-sitting for Raj's pet.

Amy and Sheldon's relationship takes a surprising turn during a game of "Dungeons & Dragons"; Lucy and Koothrappali have an awkward date.

When Leonard receives an exciting opportunity to work overseas, Penny and Sheldon are thrown for a loop.

Sheldon and Penny share secrets while Leonard is away; Wolowitz helps Raj get over his ex.

Leonard and Sheldon's friendship is tested; Wolowitz's relationship with his mom causes a threat to his masculinity.

Raj designs a scavenger hunt that brings out the best -- and the worst -- in the whole gang.

Sheldon wants revenge after Amy ruins one of his favorite films; Leonard finds a way to get Penny to do anything; Stuart and Raj make online dating profiles.

Sheldon and Amy's relationship is tested when she takes a job at his university; a fight with Bernadette leaves Howard sleeping on Raj's couch.

Sheldon's latest scientific breakthrough leaves him feeling like a fraud; a romantic gesture between Howard and Bernadette causes Penny to up her game with Leonard.

When Professor Proton asks Leonard for help with an experiment, Sheldon retaliates by befriending Proton's rival, Bill Nye.

When a mistake comes to light, Sheldon makes Leonard walk a mile in his shoes; Penny decides to confront Raj's ex.