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Once home to the most advanced civilization on Earth, the city of Atlantis is now an underwater kingdom ruled by the power-hungry King Orm. With a vast army at his disposal, Orm plans to conquer the remaining oceanic people -- and then the surface world. Standing in his way is Arthur, Orm's half-human, half-Atlantean brother and true heir to the throne. With help from royal counselor Vulko, Arthur

Eddie and Waldo share an apartment; Steve tries to be a son to Carl.

Helping a homeless man traps Urkel and Carl in a bomb shelter.

A cool fraternity tells Eddie to lose Steve as a friend.

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

A battle erupts in the neighborhood between the Coopers and the Sparks when Sheldon is terrorized by the Sparks' new dog.

Meemaw is pursued by gentlemen callers; she is forced to set ground rules when Sheldon interferes.

Sheldon dismantles the refrigerator to stop it from humming; he gets a paper route to pay for its repair.

Sheldon becomes jealous when Dr. Sturgis bonds with Paige, another ten-year-old genius; Mary invites Paige's family over for a playdate.

When Mary's faith is shaken by a tragedy in the community, Sheldon becomes an unlikely ally.

Monica fears Chandler has a sexual fetish involving sharks; Phoebe fears losing her boyfriend.

While Phoebe and Joey wait at a fancy restaurant to celebrate Phoebe's birthday, Rachel is afraid to leave her infant with a babysitter; Monica and Chandler also fail to arrive on time after they fight over Chandler's urge to resume smoking.

Ross mocks Rachel's new male nanny (Freddie Prinze Jr.); Chandler becomes upset when Monica says that somebody from her job is the funniest guy she's ever met.

Chandler and Joey find a videotape while checking out Richard's apartment; Ross sings Emma an off-color lullaby.

Rachel has a bone to pick with her self-centered sister (Christina Applegate) on Thanksgiving; Monica protects her good wedding china; Joey forgets to join his TV cast mates for the Thanksgiving parade.

Rachel impulsively gives her telephone number to a handsome guy but worries he will call when Ross is there.

Monica fears the worst when she learns Chandler will be spending Christmas in Tulsa working on a deadline with a beautiful co-worker (Selma Blair).

When Rachel visits her workplace to show off baby Emma, she is surprised to find a handsome temporary worker, Gavin, who has been doing her job while she was on maternity leave; their immediate war of wills prompts Rachel to make a rash decision that she could regret; Joey arranges for Phoebe to get a job as an extra on his daytime drama series, but she wreaks havoc on the set. And, having quit hi

Monica invites Rachel's workplace rival (Dermot Mulroney) to her birthday party; Joey flirts with Emma's new nanny (Melissa George); Phoebe and Mike (Paul Rudd) take care of a litter of rats.

Monica exults in the applause she receives on karaoke night, unaware that the cheering audience can see through her blouse.

Joey and Phoebe conspire to send Rachel and Ross on disastrous blind dates; the ovulating Monica wants to get intimate with Chandler.

Joey stumbles upon a way to impress a famous actor (Jeff Goldblum) during an audition; Ross learns the identity of a long-ago mugger; Chandler accepts an internship at a shoe company.

Leonard keeps an affair a secret from Sheldon, Howard and Raj.

Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance.

While the guys camp out for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.

Penny asks Leonard to lie to her father (Keith Carradine); Howard, Raj and Bernadette pull an all-nighter at a telescope.

Amy realizes she has feelings for Penny's ex; Koothrappali and Wolowitz try to prove who would be a better superhero.

The guys try to bond with Penny's new boyfriend through a costume contest.

Leonard's idea for a smartphone application causes friction in his friendship with Sheldon.

Bernadette runs into her ex-boyfriend (Rick Fox) while attending a science event with Wolowitz.

Sheldon takes acting lessons from Penny in hope of becoming a better teacher; Koothrappali fantasizes about his friend's girlfriend.

A wealthy donor makes Leonard question what he is willing to do for science.

Turning the tables on the locker-room dynamic, athletes from all sports pull pranks on their teammates and sports-world friends; the team behind "Impractical Jokers" helps them see the prank through from the opening tip-off to the final buzzer.

Anthony Davis and Dude Perfect's Cody Jones push Dereck Lively into a game-show disaster, while USC basketball player JuJu Watkins and coach Lindsey Gottlieb prank their team with a fake meeting that leaves them stranded on a haunted abandoned floor.