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.
01 The Bad Fish Paradigm
Sep 22, 200822m★ 7.9
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
02 The Codpiece Topology
Sep 29, 200821m★ 7.7
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
03 The Barbarian Sublimation
Oct 6, 200821m★ 7.9
Sheldon creates a monster when he introduces Penny to online gaming.
04 The Griffin Equivalency
Oct 13, 200821m★ 7.6
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
05 The Euclid Alternative
Oct 20, 200820m★ 7.6
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
06 The Cooper-Nowitzki Theorem
Nov 3, 200821m★ 7.8
Sheldon and the gang are confused when a young grad student is attracted to him.
07 The Panty Piñata Polarization
Nov 10, 200821m★ 8.0
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
08 The Lizard-Spock Expansion
Nov 17, 200820m★ 7.4
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
09 The White Asparagus Triangulation
Nov 24, 200821m★ 7.5
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
10 The Vartabedian Conundrum
Dec 8, 200821m★ 7.0
Leonard asks Penny for advice when his new relationship starts moving too fast.
11 The Bath Item Gift Hypothesis
Dec 15, 200821m★ 8.2
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
12 The Killer Robot Instability
Jan 12, 200921m★ 7.5
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 on him for.
13 The Friendship Algorithm
Jan 19, 200921m★ 7.5
Sheldon creates a scientific procedure for making friends.
14 The Financial Permeability
Feb 2, 200921m★ 7.4
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
15 The Maternal Capacitance
Feb 9, 200921m★ 8.1
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
16 The Cushion Saturation
Mar 2, 200921m★ 7.5
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
17 The Terminator Decoupling
Mar 9, 200921m★ 7.6
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.
18 The Work Song Nanocluster
Mar 16, 200920m★ 7.6
Penny's home business turns into a complete nightmare when Sheldon takes over.
19 The Dead Hooker Juxtaposition
Mar 30, 200920m★ 7.6
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
20 The Hofstadter Isotope
Apr 13, 200920m★ 7.6
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
21 The Vegas Renormalization
Apr 27, 200922m★ 7.5
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
22 The Classified Materials Turbulence
May 4, 200919m★ 7.5
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 a crucial error in a NASA project he's working on.
23 The Monopolar Expedition
May 11, 200921m★ 7.5
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.