The Big Bang Theory
Comedy • Series

The Big Bang Theory

"Smart is the new sexy."

7.9/10 2007 12 Seasons 279 Episodes Ended

Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.

Season: 1 2 3 4 5 6 7 8 9 10 11 12

Season 2 Episodes

S2E1
E1
The Bad Fish Paradigm
22 min 2008

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

S2E2
E2
The Codpiece Topology
21 min 2008

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

S2E3
E3
The Barbarian Sublimation
21 min 2008

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

S2E4
E4
The Griffin Equivalency
21 min 2008

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

S2E5
E5
The Euclid Alternative
20 min 2008

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

S2E6
E6
The Cooper-Nowitzki Theorem
21 min 2008

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

S2E7
E7
The Panty Piñata Polarization
21 min 2008

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

S2E8
E8
The Lizard-Spock Expansion
20 min 2008

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

S2E9
E9
The White Asparagus Triangulation
21 min 2008

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

S2E10
E10
The Vartabedian Conundrum
21 min 2008

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

S2E11
E11
The Bath Item Gift Hypothesis
21 min 2008

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

S2E12
E12
The Killer Robot Instability
21 min 2009

Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest o…

S2E13
E13
The Friendship Algorithm
21 min 2009

Sheldon creates a scientific procedure for making friends.

S2E14
E14
The Financial Permeability
21 min 2009

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

S2E15
E15
The Maternal Capacitance
21 min 2009

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

S2E16
E16
The Cushion Saturation
21 min 2009

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

S2E17
E17
The Terminator Decoupling
21 min 2009

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

S2E18
E18
The Work Song Nanocluster
20 min 2009

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

S2E19
E19
The Dead Hooker Juxtaposition
20 min 2009

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

S2E20
E20
The Hofstadter Isotope
20 min 2009

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

S2E21
E21
The Vegas Renormalization
22 min 2009

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

S2E22
E22
The Classified Materials Turbulence
19 min 2009

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

S2E23
E23
The Monopolar Expedition
21 min 2009

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

Cast

Johnny Galecki
Johnny Galecki
Leonard Hofstadter
Jim Parsons
Jim Parsons
Sheldon Cooper
Kaley Cuoco
Kaley Cuoco
Penny
Simon Helberg
Simon Helberg
Howard Wolowitz
Kunal Nayyar
Kunal Nayyar
Rajesh Koothrappali
Melissa Rauch
Melissa Rauch
Bernadette Rostenkowski
Mayim Bialik
Mayim Bialik
Amy Farrah Fowler

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