The BEST episodes of The Big Bang Theory season 2
Every episode of The Big Bang Theory season 2, ranked from best to worst by thousands of votes from fans of the show. The best episodes of The Big Bang Theory season 2!
A woman who moves into an apartment across the hall from two brilliant but socially awkward physicists shows them how little they know about life outside of the laboratory.
#1 - The Bath Item Gift Hypothesis
Season 2 - Episode 11 - Aired 12/15/2008
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
#2 - The Maternal Capacitance
Season 2 - Episode 15 - Aired 2/9/2009
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
#3 - The Monopolar Expedition
Season 2 - Episode 23 - Aired 5/11/2009
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
#4 - The Classified Materials Turbulence
Season 2 - Episode 22 - Aired 5/4/2009
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.
#5 - The Vegas Renormalization
Season 2 - Episode 21 - Aired 4/27/2009
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
#6 - The Panty Piñata Polarization
Season 2 - Episode 7 - Aired 11/10/2008
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate. Meanwhile, Howard and Rajesh try to find the house where all the models from "America's Top Model" are staying.
#7 - The Barbarian Sublimation
Season 2 - Episode 3 - Aired 10/6/2008
Sheldon creates a monster when he introduces Penny to online gaming. Meanwhile, Sheldon disagrees with Leslie Winkle at work.
#8 - The Cooper-Nowitzki Theorem
Season 2 - Episode 6 - Aired 11/3/2008
Sheldon and the gang are confused when a young grad student is attracted to him.
#9 - The Dead Hooker Juxtaposition
Season 2 - Episode 19 - Aired 3/30/2009
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
#10 - The White Asparagus Triangulation
Season 2 - Episode 9 - Aired 11/24/2008
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
#11 - The Bad Fish Paradigm
Season 2 - Episode 1 - Aired 9/22/2008
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
#12 - The Lizard-Spock Expansion
Season 2 - Episode 8 - Aired 11/17/2008
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
#13 - The Griffin Equivalency
Season 2 - Episode 4 - Aired 10/13/2008
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
#14 - The Vartabedian Conundrum
Season 2 - Episode 10 - Aired 12/8/2008
Leonard asks Penny for advice when his new relationship starts moving too fast.
#15 - The Work Song Nanocluster
Season 2 - Episode 18 - Aired 3/16/2009
Penny's home business turns into a complete nightmare when Sheldon takes over.
#16 - The Euclid Alternative
Season 2 - Episode 5 - Aired 10/20/2008
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
#17 - The Cushion Saturation
Season 2 - Episode 16 - Aired 3/2/2009
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
#18 - The Financial Permeability
Season 2 - Episode 14 - Aired 2/2/2009
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
#19 - The Hofstadter Isotope
Season 2 - Episode 20 - Aired 4/13/2009
When a fellow comic book enthusiast hits on Penny it leads to Leonard and Howard going to a bar's on Ladies' Night.
#20 - The Friendship Algorithm
Season 2 - Episode 13 - Aired 1/19/2009
Sheldon creates a scientific procedure for making friends.
#21 - The Terminator Decoupling
Season 2 - Episode 17 - Aired 3/9/2009
Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress is on board the train they are taking to San Francisco.
#22 - The Codpiece Topology
Season 2 - Episode 2 - Aired 9/29/2008
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie Winkle.
#23 - The Killer Robot Instability
Season 2 - Episode 12 - Aired 1/12/2009
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.