CBS

Season 1: Episode 13 - The Bat Jar Conjecture

The Bat Jar Conjecture: The guys engage in the University Physics bowl. But Sheldon is so obnoxious, he is kicked off the team. So he forms his own team with the janitor and the cafeteria lady, and he goes up against his buddies. Leslie Winkel played by Sara Gilbert returns in this one to join Leonard's team and kick Sheldon's butt.