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.

Season episodes list 2

S02E01

S02E01 : The Bad Fish Paradigm 8.31/10 (aired on 09/22/2008)

Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
S02E02

S02E02 : The Codpiece Topology 8.19/10 (aired on 09/29/2008)

A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
S02E03

S02E03 : The Barbarian Sublimation 8.75/10 (aired on 10/06/2008)

Sheldon creates a monster when he introduces Penny to online gaming.
S02E04

S02E04 : The Griffin Equivalency 8.04/10 (aired on 10/13/2008)

Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
S02E05

S02E05 : The Euclid Alternative 8.37/10 (aired on 10/20/2008)

Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
S02E06

S02E06 : The Cooper-Nowitzki Theorem 8.31/10 (aired on 11/03/2008)

Sheldon and the gang are confused when a young grad student is attracted to him.
S02E07

S02E07 : The Panty Piñata Polarization 8.66/10 (aired on 11/10/2008)

When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
S02E08

S02E08 : The Lizard-Spock Expansion 8.21/10 (aired on 11/17/2008)

Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
S02E09

S02E09 : The White Asparagus Triangulation 8.21/10 (aired on 11/24/2008)

Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
S02E10

S02E10 : The Vartabedian Conundrum 7.87/10 (aired on 12/08/2008)

Leonard asks Penny for advice when his new relationship starts moving too fast.
S02E11

S02E11 : The Bath Item Gift Hypothesis 9.1/10 (aired on 12/15/2008)

Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's…
S02E12

S02E12 : The Killer Robot Instability 8.02/10 (aired on 01/12/2009)

Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting…
S02E13

S02E13 : The Friendship Algorithm 8.12/10 (aired on 01/19/2009)

Sheldon creates a scientific procedure for making friends.
S02E14

S02E14 : The Financial Permeability 8.11/10 (aired on 02/02/2009)

Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and…
S02E15

S02E15 : The Maternal Capacitance 8.86/10 (aired on 02/09/2009)

Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
S02E16

S02E16 : The Cushion Saturation 8.2/10 (aired on 03/02/2009)

A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
S02E17

S02E17 : The Terminator Decoupling 8.29/10 (aired on 03/09/2009)

Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer…
S02E18

S02E18 : The Work Song Nanocluster 8.2/10 (aired on 03/16/2009)

Penny's home business turns into a complete nightmare when Sheldon takes over.
S02E19

S02E19 : The Dead Hooker Juxtaposition 8.3/10 (aired on 03/30/2009)

Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
S02E20

S02E20 : The Hofstadter Isotope 8.12/10 (aired on 04/13/2009)

A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's…
S02E21

S02E21 : The Vegas Renormalization 8.59/10 (aired on 04/27/2009)

Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out…
S02E22

S02E22 : The Classified Materials Turbulence 8.31/10 (aired on 05/04/2009)

Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a…
S02E23

S02E23 : The Monopolar Expedition 8.31/10 (aired on 05/11/2009)

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