The Panty Piñata Polarization
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
The Cooper-Nowitzki Theorem
Sheldon and the gang are confused when a young grad student is attracted to him.
The Euclid Alternative
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
The Griffin Equivalency
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
The Barbarian Sublimation
Sheldon creates a monster when he introduces Penny to online gaming.
The Codpiece Topology
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
The Bad Fish Paradigm
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
The Work Song Nanocluster
Penny's home business turns into a complete nightmare when Sheldon takes over.
The Terminator Decoupling
Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco.
The Cushion Saturation
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.