The Big Bang Theory - Season 2

This season, Leonard gets a girl. So does Sheldon. Howard drives the Mars Rover into a ditch. Raj woos a terminator. Gorgeous girl-next-door Penny falls under the spell of Age of Conan. And super-smart, ueberconfident Leslie Winkler reduces mere men to spineless jellyfish.

23 Episodes

The Bad Fish Paradigm

Season 2 - Episode 1

Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.

The Codpiece Topology

Season 2 - Episode 2

A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.

The Barbarian Sublimation

Season 2 - Episode 3

Sheldon creates a monster when he introduces Penny to online gaming.

The Griffin Equivalency

Season 2 - Episode 4

Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.

The Euclid Alternative

Season 2 - Episode 5

Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.

The Cooper-Nowitzki Theorem

Season 2 - Episode 6

Sheldon and the gang are confused when a young grad student is attracted to him.

The Panty Piñata Polarization

Season 2 - Episode 7

When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.

The Lizard-Spock Expansion

Season 2 - Episode 8

Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.

The White Asparagus Triangulation

Season 2 - Episode 9

Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.

The Vartabedian Conundrum

Season 2 - Episode 10

Leonard asks Penny for advice when his new relationship starts moving too fast.

The Bath Item Gift Hypothesis

Season 2 - Episode 11

Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.

The Killer Robot Instability

Season 2 - Episode 12

Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending...

The Friendship Algorithm

Season 2 - Episode 13

Sheldon creates a scientific procedure for making friends.

The Financial Permeability

Season 2 - Episode 14

Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.

The Maternal Capacitance

Season 2 - Episode 15

Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.

The Cushion Saturation

Season 2 - Episode 16

A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.

The Terminator Decoupling

Season 2 - Episode 17

Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are takin...

The Work Song Nanocluster

Season 2 - Episode 18

Penny's home business turns into a complete nightmare when Sheldon takes over.

The Dead Hooker Juxtaposition

Season 2 - Episode 19

Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."

The Hofstadter Isotope

Season 2 - Episode 20

A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.

The Vegas Renormalization

Season 2 - Episode 21

Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penn...

The Classified Materials Turbulence

Season 2 - Episode 22

Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there's...

The Monopolar Expedition

Season 2 - Episode 23

The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.