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Eps14The Big Bang Theory Season 1 Episode 14

The Big Bang Theory Season 1 Episode 14

The Big Bang Theory Season 1 Episode 14
Season 1
Episode: 14
Air Date: 2008-04-28

When delivery of another collectible leads to Penny’s lashing out at Leonard, he decides it’s time to give up his habit, much to his friends’ protestation.

Episode Title: The Nerdvana Annihilation
Eps15The Big Bang Theory Season 1 Episode 15

The Big Bang Theory Season 1 Episode 15

The Big Bang Theory Season 1 Episode 15
Season 1
Episode: 15
Air Date: 2008-05-05

The rest of the gang fall for Sheldon’s twin sister, and Leonard’s plan to win her heart is derailed when Sheldon declares he’ll be the one to decide who can…

Episode Title: The Pork Chop Indeterminacy
Eps16The Big Bang Theory Season 1 Episode 16

The Big Bang Theory Season 1 Episode 16

The Big Bang Theory Season 1 Episode 16
Season 1
Episode: 16
Air Date: 2008-05-12

Penny wants to throw a surprise party for Leonard, but Sheldon’s indulgence at an electronics store throws her off-track.

Episode Title: The Peanut Reaction
Eps17The Big Bang Theory Season 1 Episode 17

The Big Bang Theory Season 1 Episode 17

The Big Bang Theory Season 1 Episode 17
Season 1
Episode: 17
Air Date: 2008-05-19

Penny’s break-up spurs Leonard to summon the courage to ask her out, and each goes to Sheldon for advice on their upcoming date.

Episode Title: The Tangerine Factor
Eps7The Big Bang Theory Season 1 Episode 7

The Big Bang Theory Season 1 Episode 7

The Big Bang Theory Season 1 Episode 7
Season 1
Episode: 7
Air Date: 2007-11-05

With Wolowitz AWOL with one of her friends, Penny’s recruited to fill in for him on the guys’ Halo team

Episode Title: The Dumpling Paradox
Eps10The Big Bang Theory Season 1 Episode 10

The Big Bang Theory Season 1 Episode 10

The Big Bang Theory Season 1 Episode 10
Season 1
Episode: 10
Air Date: 2008-03-24

Leonard and Sheldon each lie to avoid seeing Penny’s concert, but Sheldon’s is a bit too complicated for his own good.

Episode Title: The Loobenfeld Decay
Eps11The Big Bang Theory Season 1 Episode 11

The Big Bang Theory Season 1 Episode 11

The Big Bang Theory Season 1 Episode 11
Season 1
Episode: 11
Air Date: 2008-03-31

With his friends knowing how sour he acts when sick—and avoiding him as a result—Sheldon is nursed by Penny, who hasn’t a clue what she’s in for.

Episode Title: The Pancake Batter Anomaly
Eps12The Big Bang Theory Season 1 Episode 12

The Big Bang Theory Season 1 Episode 12

The Big Bang Theory Season 1 Episode 12
Season 1
Episode: 12
Air Date: 2008-04-14

With Sheldon rattled over meeting Dennis, a 15-year-old physicist who’s smarter than he, Leonard helps him look for a way to debunk Dennis’s research.

Episode Title: The Jerusalem Duality
Eps13The Big Bang Theory Season 1 Episode 13

The Big Bang Theory Season 1 Episode 13

The Big Bang Theory Season 1 Episode 13
Season 1
Episode: 13
Air Date: 2008-04-21

Sheldon finds himself booted from the gang’s Physics Bowl team and replaced with Leslie, so he forms his own team, hoping to prove he’s superior.

Episode Title: The Bat Jar Conjecture
Eps2The Big Bang Theory Season 1 Episode 2

The Big Bang Theory Season 1 Episode 2

The Big Bang Theory Season 1 Episode 2
Season 1
Episode: 2
Air Date: 2007-10-01

Leonard volunteers to sign for a package in an attempt to make a good impression on Penny, but when he enlists Sheldon for help, his attempt at chivalry goes terribly…

Episode Title: The Big Bran Hypothesis
Eps3The Big Bang Theory Season 1 Episode 3

The Big Bang Theory Season 1 Episode 3

The Big Bang Theory Season 1 Episode 3
Season 1
Episode: 3
Air Date: 2007-10-08

Leonard asks a woman out after he finds out that Penny is seeing someone.

Episode Title: The Fuzzy Boots Corollary
Eps4The Big Bang Theory Season 1 Episode 4

The Big Bang Theory Season 1 Episode 4

The Big Bang Theory Season 1 Episode 4
Season 1
Episode: 4
Air Date: 2007-10-14

Sheldon’s getting fired forces him to explore what life has to offer outside physics, leaving Leonard to take drastic action to snap his friend out of his funk.

Episode Title: The Luminous Fish Effect
Eps6The Big Bang Theory Season 1 Episode 6

The Big Bang Theory Season 1 Episode 6

The Big Bang Theory Season 1 Episode 6
Season 1
Episode: 6
Air Date: 2007-10-29

Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.

Episode Title: The Middle-Earth Paradigm
Eps22The Big Bang Theory Season 2 Episode 22

The Big Bang Theory Season 2 Episode 22

The Big Bang Theory Season 2 Episode 22
Season 2
Episode: 22
Air Date: 2009-05-04

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…

Episode Title: The Classified Materials Turbulence
Eps23The Big Bang Theory Season 2 Episode 23

The Big Bang Theory Season 2 Episode 23

The Big Bang Theory Season 2 Episode 23
Season 2
Episode: 23
Air Date: 2009-05-11

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

Episode Title: The Monopolar Expedition
Eps12The Big Bang Theory Season 2 Episode 12

The Big Bang Theory Season 2 Episode 12

The Big Bang Theory Season 2 Episode 12
Season 2
Episode: 12
Air Date: 2009-01-12

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.

Episode Title: The Killer Robot Instability
Eps13The Big Bang Theory Season 2 Episode 13

The Big Bang Theory Season 2 Episode 13

The Big Bang Theory Season 2 Episode 13
Season 2
Episode: 13
Air Date: 2009-01-19

Sheldon creates a scientific procedure for making friends.

Episode Title: The Friendship Algorithm
Eps14The Big Bang Theory Season 2 Episode 14

The Big Bang Theory Season 2 Episode 14

The Big Bang Theory Season 2 Episode 14
Season 2
Episode: 14
Air Date: 2009-02-02

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

Episode Title: The Financial Permeability
Eps15The Big Bang Theory Season 2 Episode 15

The Big Bang Theory Season 2 Episode 15

The Big Bang Theory Season 2 Episode 15
Season 2
Episode: 15
Air Date: 2009-02-09

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

Episode Title: The Maternal Capacitance
Eps16The Big Bang Theory Season 2 Episode 16

The Big Bang Theory Season 2 Episode 16

The Big Bang Theory Season 2 Episode 16
Season 2
Episode: 16
Air Date: 2009-03-02

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

Episode Title: The Cushion Saturation
Eps17The Big Bang Theory Season 2 Episode 17

The Big Bang Theory Season 2 Episode 17

The Big Bang Theory Season 2 Episode 17
Season 2
Episode: 17
Air Date: 2009-03-09

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.

Episode Title: The Terminator Decoupling
Eps18The Big Bang Theory Season 2 Episode 18

The Big Bang Theory Season 2 Episode 18

The Big Bang Theory Season 2 Episode 18
Season 2
Episode: 18
Air Date: 2009-03-16

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

Episode Title: The Work Song Nanocluster
Eps19The Big Bang Theory Season 2 Episode 19

The Big Bang Theory Season 2 Episode 19

The Big Bang Theory Season 2 Episode 19
Season 2
Episode: 19
Air Date: 2009-03-30

Penny squares off with a new beautiful female neighbor who may become the building’s “new Penny.”

Episode Title: The Dead Hooker Juxtaposition
Eps20The Big Bang Theory Season 2 Episode 20

The Big Bang Theory Season 2 Episode 20

The Big Bang Theory Season 2 Episode 20
Season 2
Episode: 20
Air Date: 2009-04-13

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

Episode Title: The Hofstadter Isotope
Eps5The Big Bang Theory Season 2 Episode 5

The Big Bang Theory Season 2 Episode 5

The Big Bang Theory Season 2 Episode 5
Season 2
Episode: 5
Air Date: 2008-10-20

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

Episode Title: The Euclid Alternative
Eps21The Big Bang Theory Season 2 Episode 21

The Big Bang Theory Season 2 Episode 21

The Big Bang Theory Season 2 Episode 21
Season 2
Episode: 21
Air Date: 2009-04-27

Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.

Episode Title: The Vegas Renormalization
Eps6The Big Bang Theory Season 2 Episode 6

The Big Bang Theory Season 2 Episode 6

The Big Bang Theory Season 2 Episode 6
Season 2
Episode: 6
Air Date: 2008-11-03

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

Episode Title: The Cooper-Nowitzki Theorem
Eps7The Big Bang Theory Season 2 Episode 7

The Big Bang Theory Season 2 Episode 7

The Big Bang Theory Season 2 Episode 7
Season 2
Episode: 7
Air Date: 2008-11-10

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

Episode Title: The Panty Piñata Polarization
Eps8The Big Bang Theory Season 2 Episode 8

The Big Bang Theory Season 2 Episode 8

The Big Bang Theory Season 2 Episode 8
Season 2
Episode: 8
Air Date: 2008-11-17

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

Episode Title: The Lizard-Spock Expansion
Eps9The Big Bang Theory Season 2 Episode 9

The Big Bang Theory Season 2 Episode 9

The Big Bang Theory Season 2 Episode 9
Season 2
Episode: 9
Air Date: 2008-11-24

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

Episode Title: The White Asparagus Triangulation
Eps10The Big Bang Theory Season 2 Episode 10

The Big Bang Theory Season 2 Episode 10

The Big Bang Theory Season 2 Episode 10
Season 2
Episode: 10
Air Date: 2008-12-08

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

Episode Title: The Vartabedian Conundrum
Eps11The Big Bang Theory Season 2 Episode 11

The Big Bang Theory Season 2 Episode 11

The Big Bang Theory Season 2 Episode 11
Season 2
Episode: 11
Air Date: 2008-12-15

Penny starts dating Leonard’s handsome colleague; Leonard and his friends are tortured by Sheldon’s obsession with gift-giving etiquette.

Episode Title: The Bath Item Gift Hypothesis
Eps1The Big Bang Theory Season 2 Episode 1

The Big Bang Theory Season 2 Episode 1

The Big Bang Theory Season 2 Episode 1
Season 2
Episode: 1
Air Date: 2008-09-22

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

Episode Title: The Bad Fish Paradigm
Eps2The Big Bang Theory Season 2 Episode 2

The Big Bang Theory Season 2 Episode 2

The Big Bang Theory Season 2 Episode 2
Season 2
Episode: 2
Air Date: 2008-09-29

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

Episode Title: The Codpiece Topology
Eps3The Big Bang Theory Season 2 Episode 3

The Big Bang Theory Season 2 Episode 3

The Big Bang Theory Season 2 Episode 3
Season 2
Episode: 3
Air Date: 2008-10-06

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

Episode Title: The Barbarian Sublimation
Eps4The Big Bang Theory Season 2 Episode 4

The Big Bang Theory Season 2 Episode 4

The Big Bang Theory Season 2 Episode 4
Season 2
Episode: 4
Air Date: 2008-10-13

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

Episode Title: The Griffin Equivalency
Eps21The Big Bang Theory Season 3 Episode 21

The Big Bang Theory Season 3 Episode 21

The Big Bang Theory Season 3 Episode 21
Season 3
Episode: 21
Air Date: 2010-05-10

Leonard and Sheldon compete for the attention of a famous female physicist.

Episode Title: The Plimpton Stimulation
Eps22The Big Bang Theory Season 3 Episode 22

The Big Bang Theory Season 3 Episode 22

The Big Bang Theory Season 3 Episode 22
Season 3
Episode: 22
Air Date: 2010-05-17

Leonard tells Penny about how he met Sheldon for the first time…and what happened to the elevator.

Episode Title: The Staircase Implementation
Eps17The Big Bang Theory Season 3 Episode 17

The Big Bang Theory Season 3 Episode 17

The Big Bang Theory Season 3 Episode 17
Season 3
Episode: 17
Air Date: 2010-03-08

When the guys find a ring from “The Lord of the Rings” at a garage sale, it threatens to tear them apart.

Episode Title: The Precious Fragmentation
Eps18The Big Bang Theory Season 3 Episode 18

The Big Bang Theory Season 3 Episode 18

The Big Bang Theory Season 3 Episode 18
Season 3
Episode: 18
Air Date: 2010-03-22

Sheldon’s friends come to his aid when his fear of public speaking stands between him and a coveted award.

Episode Title: The Pants Alternative