Wanting to focus on building his database, Sheldon considers dropping out of college; George Sr. is left frustrated when someone else is credited for his wins.
Joey poses as a Porsche driver while trying to locate the car's actual owner; Ross and Rachel are forced to get a divorce when the annulment falls through.
Before moving, Chandler helps Joey financially by "losing" money to him in various games; Ross pretends to stay home with Ben to avoid helping Chandler move.
Rachel and Phoebe decide to start running together, but Rachel is thrown off by the fact that Phoebe runs like a four-year-old; Joey finds a sexy new roommate.
Ross bleaches his teeth for a date with Monica's coworker, which makes his teeth glow in the dark; Rachel's co-workers think she slept with Ralph Lauren.
Chandler and Ross fight over ownership of a joke published in Playboy; a broke Joey starts working at Central Perk; Phoebe's wayward remark causes trouble.
After her father cuts her off, Rachel's sister, Jill, comes to town and goes on a date with Ross; Joey gets in trouble for giving female customers free food.
The conclusion of the "what if" episode shows Ross having a threesome with Susan and Carol, Rachel kissing Joey and Monica and Chandler hooking up regardless.
Amy and Leonard begin bonding over different science experiments after Sheldon kicks Amy out to do his work alone; Bert Kibbler takes Howard's spot in a band.
Koothrappali discovers that the woman he's been dating has a husband; Sheldon irritates Leonard while he rents his old room to use a quiet place to work.
Bernadette's friends try to figure out how to induce labor; Howards confronts Bernadette when he learns that she has already picked a name for their son.
Leonard goes through extreme measures to secure Amy and Sheldon's wedding venue; Bernadette and Howard try to figure out who is going to return to work.
Philanthropist Bill Gates' company considers a partnership with Penny's pharmaceutical company; Sheldon believes he's the victim of an April Fools' Day prank.
Leonard decides to run against Sheldon for president of the tenants association; Howard and Raj look for the owner of a drone that landed in their backyard.
A colossal ape tasked with protecting the world must join forces with a reptilian monster in hopes of protecting the world from a clan of giant-sized apes.