Teenagers come to possess the power of gods and set out to be superheroes, but a group of gods from another realm come in search of the special powers.
Phil and Jay pick up Lily's old princess castle for Joe, but Jay thinks Joe plays with too many girl toys; Gloria helps Haley stand up for herself at work.
Alex is horrified when both she and her biggest rival, Sunjay, are named Valedictorian; Gloria is distracted from preparing for her U.S. citizenship test.
The family gathers to celebrate Alex's graduation, minus Phil, who, after getting stuck in Seattle, discovered a way to attend using Skype and a robot.
Mary struggles to get along with Sheldon's drama teacher over an upcoming church Halloween fundraiser; Georgie becomes interested in a girl Sheldon is tutoring.
Sheldon and Paige, another child genius, get into trouble at the science museum; George Sr. is forced into a therapist's role for Paige's argumentative parents.
Sheldon begins working on a psychology project and studies his family for it; Thanksgiving dinner gets heated when George Sr. is asked about a job in Oklahoma.
Sheldon tries to act more like a kid out of fear of becoming a future social outcast; Meemaw's relationship with Dr. Sturgis is tested when he learns to drive.
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.
Ross ponders dating a student who is smitten with him, even though it could cost him his job; Rachel moves in with Joey after her apartment burns down.
Joey's fridge is broken and he tries to cajole his friends into helping him buy a new one; Phoebe, Monica and Chandler compete to get Rachel a date for a ball.
An online critic picks apart Leonard and Sheldon's physics paper; Penny, Amy and Bernadette reflect on some of their more shameful moments from the past.
A geek-turned-lethal CIA agent recruits an accountant who used to be the most popular athlete in his high school to save the U.S. spy satellite system.
When a former hostage rescuer is assessing the security of the tallest building in the world, he finds himself accused of setting the skyscraper on fire.