Sheldon irks the gangs with his obession with proper Christmas gift protocol. Lenoard's crushed when Penny dates a colleague of his.
Leonard seeks Penny's counsel when his relationship with Stephanie takes off faster than he'd like. Sheldon's hypochondriac tendencies get the better of him.
Sheldon is overexuberant that Leonard finally has a girlfriend matching his high standards.
A girl Wolowitz has a major crush on falls for Leonard. Sheldon tries to improve rock-paper-scissors.
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate. Howard and Raj search for the America's Next Top Model house.
Sheldon, and his friends, are mystified when a younger grad student is attracted to him.
An intervention is used to try to force Sheldon to overcome his fear of driving
Full of confidence following getting a paper published, Raj hits on Penny.
Penny feels frustrated by her failures at life. After Sheldon is taking a break from his MMORPG, he notices that Penny is having a bad day. Penny had accidentally used her car keys for her apartment door. She claims she has not had sex in six months, didn’t get her ...
The guys return from a Renaissance Fair and see Penny with a new guy, prompting a jealous Leonard to pursue a relationship with fellow physicist Leslie Winkle.