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The Monopolar Expedition
The Big Bang Theory - S2 - E23
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
The Big Bang Theory: Season 2 - 23 Episode s
2x1 - The Bad Fish Paradigm
September 22, 2008
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
2x2 - The Codpiece Topology
September 29, 2008
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
2x3 - The Barbarian Sublimation
October 6, 2008
Sheldon creates a monster when he introduces Penny to online gaming.
2x4 - The Griffin Equivalency
October 13, 2008
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
2x5 - The Euclid Alternative
October 20, 2008
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
2x6 - The Cooper-Nowitzki Theorem
November 3, 2008
Sheldon and the gang are confused when a young grad student is attracted to him.
2x7 - The Panty Piñata Polarization
November 10, 2008
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
2x8 - The Lizard-Spock Expansion
November 17, 2008
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
2x9 - The White Asparagus Triangulation
November 24, 2008
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
2x10 - The Vartabedian Conundrum
December 8, 2008
Leonard asks Penny for advice when his new relationship starts moving too fast.
2x11 - The Bath Item Gift Hypothesis
December 15, 2008
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
2x12 - The Killer Robot Instability
January 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.
2x13 - The Friendship Algorithm
January 19, 2009
Sheldon creates a scientific procedure for making friends.
2x14 - The Financial Permeability
February 2, 2009
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
2x15 - The Maternal Capacitance
February 9, 2009
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
2x16 - The Cushion Saturation
March 2, 2009
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
2x17 - The Terminator Decoupling
March 9, 2009
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.
2x18 - The Work Song Nanocluster
March 16, 2009
Penny's home business turns into a complete nightmare when Sheldon takes over.
2x19 - The Dead Hooker Juxtaposition
March 30, 2009
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
2x20 - The Hofstadter Isotope
April 13, 2009
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
2x21 - The Vegas Renormalization
April 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.
2x22 - The Classified Materials Turbulence
May 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.
2x23 - The Monopolar Expedition
May 11, 2009
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
The Big Bang Theory: All seasons
S0: Specials
3 Episode s
S1: Season 1
17 Episode s
S2: Season 2
23 Episode s
S3: Season 3
23 Episode s
S4: Season 4
24 Episode s
S5: Season 5
24 Episode s
S6: Season 6
24 Episode s
S7: Season 7
24 Episode s
S8: Season 8
24 Episode s
S9: Season 9
24 Episode s
S10: Season 10
24 Episode s
S11: Season 11
24 Episode s
S12: Season 12
24 Episode s