After her first date with Leonard goes awry, Penny confides to Sheldon that she lied to Leonard about going to community college. Sheldon goes to great lengths to keep her secret, but even moving out of the apartment can't prevent him from revealing the secret to Leonard. When Leonard tries to assuage Penny's concerns, he makes things worse.
When Leonard sees Penny with a handsome new guy, he enters into a rebound relationship with Sheldon's nemesis, Leslie. After getting into a theoretical fight about physics, Leslie breaks off the relationship.
When Penny has a bad day, Sheldon invites her over and she gets hooked on the video game he's playing. Meanwhile, at work Sheldon disagrees with Leslie.
Raj, newly famous because of an article in People magazine, gets a big head and invites Penny with him to the big party. He gets drunk so he can talk with her, but the plan backfires as he gets more obnoxious and egotistical.
Leonard and his friends stage an intervention to make Sheldon confront his longstanding fear of driving.
A young graduate student's attraction to Sheldon confuses everyone, including Sheldon himself, but things end abruptly when he refuses to share credit for a break-through he makes with her help.
Penny vows to get revenge on Sheldon when he bans her from the apartment for a series of petty infractions. Meanwhile, Howard and Rajesh try to find the house where all the models from "America's Top Model" are staying.
Wolowitz thinks he's found the love of his life, until she meets Leonard.
Sheldon can barely contain his joy when Leonard starts dating a woman who meets Sheldon's exacting standards.