Leonard and Sheldon are brilliant physicists, the kind of "beautiful minds" that understand how the universe works. But none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty named Penny moves in next door. Leonard sees in Penny a whole new universe of possibilities... including love.
Change Summary
Change Summary
+ Series 3
+ Episode 19 - TBA
TBA
+ Episode 18 - The Pants Alternative
Aired - 22 March 2010
Episode summary:
Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.
Episode summary:
Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.
Reviews
No Reviews. Add your review+ Episode 17 - The Precious Fragmentation
+ Episode 16 - The Excelsior Acquisition
Aired - 01 March 2010
Episode summary:
Sheldon winds up in traffic court when he gets a ticket because of Penny.
Episode summary:
Sheldon winds up in traffic court when he gets a ticket because of Penny.
Reviews
No Reviews. Add your review+ Episode 15 - The Large Hadron Collision
+ Episode 14 - The Einstein Approximation
Aired - 01 February 2010
Episode summary:
Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
Episode summary:
Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
Reviews
No Reviews. Add your review+ Episode 13 - The Bozeman Reaction
Aired - 18 January 2010
Episode summary:
When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
Episode summary:
When their apartment is robbed, Leonard and Sheldon turn to their friends to create a state-of-the-art security system.
Reviews
No Reviews. Add your review+ Episode 12 - The Psychic Vortex
Aired - 11 January 2010
Episode summary:
Sheldon attempts to help Penny understand Leonard's work, and Wolowitz becomes jealous when Leonard starts hanging out with his new girlfriend.
Episode summary:
Sheldon attempts to help Penny understand Leonard's work, and Wolowitz becomes jealous when Leonard starts hanging out with his new girlfriend.
Reviews
No Reviews. Add your review+ Episode 11 - The Maternal Congruence
Aired - 14 December 2009
Episode summary:
A visit from Leonard's mother delights Sheldon and horrifies Leonard.
Episode summary:
A visit from Leonard's mother delights Sheldon and horrifies Leonard.
Reviews
No Reviews. Add your review+ Episode 10 - The Gorilla Experiment
Aired - 07 December 2009
Episode summary:
Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.
Episode summary:
Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.
Reviews
No Reviews. Add your review+ Episode 9 - The Vengeance Formulation
Aired - 23 November 2009
Episode summary:
After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.
Episode summary:
After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.
Reviews
No Reviews. Add your review+ Episode 8 - The Adhesive Duck Deficiency
Aired - 16 November 2009
Episode summary:
With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
Episode summary:
With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
Reviews
No Reviews. Add your review+ Episode 7 - The Guitarist Amplification
Aired - 09 November 2009
Episode summary:
An argument between Leonard and Penny proves "inconvenient" to Sheldon.
Episode summary:
An argument between Leonard and Penny proves "inconvenient" to Sheldon.
Reviews
No Reviews. Add your review+ Episode 6 - The Cornhusker Vortex
+ Episode 5 - The Creepy Candy Coating Corollary
+ Episode 4 - The Pirate Solution
Aired - 12 October 2009
Episode summary:
Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as third wheel.
Episode summary:
Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as third wheel.
Reviews
No Reviews. Add your review+ Episode 3 - The Gothowitz Deviation
Aired - 05 October 2009
Episode summary:
Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.
Episode summary:
Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.
Reviews
No Reviews. Add your review+ Episode 2 - The Jiminy Conjecture
+ Episode 1 - The Electric Can Opener Fluctuation
+ Series 2
+ Episode 23 - The Monopolar Expedition
Aired - 11 May 2009
Episode summary:
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
Episode summary:
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
Reviews
No Reviews. Add your review+ Episode 22 - The Classified Materials Turbulence
Aired - 04 May 2009
Episode summary:
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.
Episode summary:
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.
Reviews
No Reviews. Add your review+ Episode 21 - The Vegas Renormalization
Aired - 27 April 2009
Episode summary:
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
Episode summary:
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
Reviews
No Reviews. Add your review+ Episode 20 - The Hofstadter Isotope
Aired - 13 April 2009
Episode summary:
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
Episode summary:
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
Reviews
No Reviews. Add your review+ Episode 19 - The Dead Hooker Juxtaposition
Aired - 30 March 2009
Episode summary:
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
Episode summary:
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
Reviews
No Reviews. Add your review+ Episode 18 - The Work Song Nanocluster
Aired - 16 March 2009
Episode summary:
Penny's home business turns into a complete nightmare when Sheldon takes over.
Episode summary:
Penny's home business turns into a complete nightmare when Sheldon takes over.
Reviews
No Reviews. Add your review+ Episode 17 - The Terminator Decoupling
Aired - 09 March 2009
Episode summary:
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 summary:
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.
Reviews
No Reviews. Add your review+ Episode 16 - The Cushion Saturation
Aired - 02 March 2009
Episode summary:
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
Episode summary:
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
Reviews
No Reviews. Add your review+ Episode 15 - The Maternal Capacitance
Aired - 09 February 2009
Episode summary:
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
Episode summary:
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
Reviews
No Reviews. Add your review+ Episode 14 - The Financial Permeability
Aired - 02 February 2009
Episode summary:
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
Episode summary:
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
Reviews
No Reviews. Add your review+ Episode 13 - The Friendship Algorithm
Aired - 19 January 2009
Episode summary:
Sheldon creates a scientific procedure for making friends.
Episode summary:
Sheldon creates a scientific procedure for making friends.
Reviews
No Reviews. Add your review+ Episode 12 - The Killer Robot Instability
Aired - 12 January 2009
Episode summary:
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 summary:
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.
Reviews
No Reviews. Add your review+ Episode 11 - The Bath Item Gift Hypothesis
Aired - 15 December 2008
Episode summary:
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
Episode summary:
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
Reviews
No Reviews. Add your review+ Episode 10 - The Vartabedian Conundrum
Aired - 08 December 2008
Episode summary:
Leonard asks Penny for advice when his new relationship starts moving too fast.
Episode summary:
Leonard asks Penny for advice when his new relationship starts moving too fast.
Reviews
No Reviews. Add your review+ Episode 9 - The White Asparagus Triangulation
Aired - 24 November 2008
Episode summary:
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
Episode summary:
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
Reviews
No Reviews. Add your review+ Episode 8 - The Lizard-Spock Expansion
Aired - 17 November 2008
Episode summary:
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
Episode summary:
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
Reviews
No Reviews. Add your review+ Episode 7 - The Panty Piñata Polarization
Aired - 10 November 2008
Episode summary:
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
Episode summary:
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
Reviews
No Reviews. Add your review+ Episode 6 - The Cooper-Nowitzki Theorem
Aired - 03 November 2008
Episode summary:
Sheldon and the gang are confused when a young grad student is attracted to him.
Episode summary:
Sheldon and the gang are confused when a young grad student is attracted to him.
Reviews
No Reviews. Add your review+ Episode 5 - The Euclid Alternative
Aired - 20 October 2008
Episode summary:
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
Episode summary:
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
Reviews
No Reviews. Add your review+ Episode 4 - The Griffin Equivalency
Aired - 13 October 2008
Episode summary:
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
Episode summary:
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
Reviews
No Reviews. Add your review+ Episode 3 - The Barbarian Sublimation
Aired - 06 October 2008
Episode summary:
Sheldon creates a monster when he introduces Penny to online gaming.
Episode summary:
Sheldon creates a monster when he introduces Penny to online gaming.
Reviews
No Reviews. Add your review+ Episode 2 - The Codpiece Topology
Aired - 29 September 2008
Episode summary:
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
Episode summary:
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
Reviews
No Reviews. Add your review+ Episode 1 - The Bad Fish Paradigm
Aired - 22 September 2008
Episode summary:
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
Episode summary:
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
Reviews
No Reviews. Add your review+ Series 1
+ Episode 17 - The Tangerine Factor
Aired - 19 May 2008
Episode summary:
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 summary:
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.
Reviews
No Reviews. Add your review+ Episode 16 - The Peanut Reaction
Aired - 12 May 2008
Episode summary:
Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.
Episode summary:
Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track.
Reviews
No Reviews. Add your review+ Episode 15 - The Pork Chop Indeterminacy
Aired - 05 May 2008
Episode summary:
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 date her.
Episode summary:
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 date her.
Reviews
No Reviews. Add your review+ Episode 14 - The Nerdvana Annihilation
Aired - 28 April 2008
Episode summary:
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 summary:
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.
Reviews
No Reviews. Add your review+ Episode 13 - The Bat Jar Conjecture
Aired - 21 April 2008
Episode summary:
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 summary:
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.
Reviews
No Reviews. Add your review+ Episode 12 - The Jerusalem Duality
Aired - 14 April 2008
Episode summary:
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' research.
Episode summary:
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' research.
Reviews
No Reviews. Add your review+ Episode 11 - The Pancake Batter Anomaly
Aired - 31 March 2008
Episode summary:
With his friends knowing how sour he acts when sick—and avoiding him as a result—Sheldon is nursed for by Penny, who hasn't a clue what she's in for.
Episode summary:
With his friends knowing how sour he acts when sick—and avoiding him as a result—Sheldon is nursed for by Penny, who hasn't a clue what she's in for.
Reviews
No Reviews. Add your review+ Episode 10 - The Loobenfeld Decay
Aired - 24 March 2008
Episode summary:
Leonard and Sheldon each lie to avoid seeing Penny's concert, but Sheldon's is a bit too complicated for his own good.
Episode summary:
Leonard and Sheldon each lie to avoid seeing Penny's concert, but Sheldon's is a bit too complicated for his own good.
Reviews
No Reviews. Add your review+ Episode 9 - The Cooper-Hofstadter Polarization
Aired - 17 March 2008
Episode summary:
When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between he and Leonard, and Penny's intervention only exacerbates the situation.
Episode summary:
When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between he and Leonard, and Penny's intervention only exacerbates the situation.
Reviews
No Reviews. Add your review+ Episode 8 - The Grasshopper Experiment
Aired - 12 November 2007
Episode summary:
Raj's parents set him up on a blind date, and when he discovers he can talk to her, she shows interest in Sheldon.
Episode summary:
Raj's parents set him up on a blind date, and when he discovers he can talk to her, she shows interest in Sheldon.
Reviews
No Reviews. Add your review+ Episode 7 - The Dumpling Paradox
Aired - 05 November 2007
Episode summary:
With Wolowitz AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team
Episode summary:
With Wolowitz AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team
Reviews
No Reviews. Add your review+ Episode 6 - The Middle Earth Paradigm
Aired - 29 October 2007
Episode summary:
Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.
Episode summary:
Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills.
Reviews
No Reviews. Add your review+ Episode 5 - The Hamburger Postulate
Aired - 22 October 2007
Episode summary:
Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie.
Episode summary:
Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie.
Reviews
No Reviews. Add your review+ Episode 4 - The Luminous Fish Effect
Aired - 15 October 2007
Episode summary:
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 summary:
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.
Reviews
No Reviews. Add your review+ Episode 3 - The Fuzzy Boots Corollary
Aired - 08 October 2007
Episode summary:
Leonard asks a woman out after he finds out that Penny is seeing someone.
Episode summary:
Leonard asks a woman out after he finds out that Penny is seeing someone.
Reviews
No Reviews. Add your review+ Episode 2 - The Big Bran Hypothesis
Aired - 01 October 2007
Episode summary:
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 awry.
Episode summary:
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 awry.
Reviews
No Reviews. Add your review+ Episode 1 - The Pilot
Aired - 24 September 2007
Episode summary:
Brilliant physicist roommates Leonard and Sheldon meet their new neighbor Penny, who begins showing them that as much as they know about science, they know little about actual living.
Episode summary:
Brilliant physicist roommates Leonard and Sheldon meet their new neighbor Penny, who begins showing them that as much as they know about science, they know little about actual living.
Reviews
No Reviews. Add your review+ Episode 0 - Pilot (Preair)
Aired - Air date unknown.
Episode summary:
Brilliant physicist roommates Leonard and Sheldon meet their new neighbor Penny, who begins showing them that as much as they know about science, they know little about actual living.
Episode summary:
Brilliant physicist roommates Leonard and Sheldon meet their new neighbor Penny, who begins showing them that as much as they know about science, they know little about actual living.
Reviews
No Reviews. Add your review+ Series Specials
+ Episode 4 - Quantum Mechanics of The Big Bang Theory
Aired - Air date unknown.
Episode summary:
A Behind The Scenes Look Into Geek Chic with clips from the show interspersed by Chuck Lorre and executive producer Bill Prady that is a well made and entertaining look into how the show was pulled together.
Episode summary:
A Behind The Scenes Look Into Geek Chic with clips from the show interspersed by Chuck Lorre and executive producer Bill Prady that is a well made and entertaining look into how the show was pulled together.
Reviews
No Reviews. Add your review+ Episode 3 - Testing The Infinte Hilarity Hypothesis
+ Episode 2 - Season 2 Gag Reel
+ Episode 1 - Physicist To The Stars
Other Trailers
Reviews
No Reviews. Add your reviewShow chat
Start new show discussion No current topics.Latest The Big Bang Theory News
The Big Bang Theory season 3
The Big Bang Theory season 3 premiers on Monday 21st September on CBS at 9:30-10pm. The first episode is titled "The Electric Can Opener Fluctuation".
Episode Synopsis:
Sheldon flees back to Texas in disgrace when he learns the guys tampered with his arctic expedition data, forcing the guys to follow him and threatening Leonard's hopes for a romantic encounter with P...read more
Episode Synopsis:
Sheldon flees back to Texas in disgrace when he learns the guys tampered with his arctic expedition data, forcing the guys to follow him and threatening Leonard's hopes for a romantic encounter with P...read more
Summer Glau Arrives with a Big Bang
The March 9 episode of The Big Bang Theory wiil be when Summer Glau — butt-kicking Cameron on Fox's Terminator: The Sarah Connor Chronicles — guest-stars as herself. And this photo is a first look at what is ostensibly the gang's reaction to stumbling upon (perhaps literally) the sci-fi siren.
read more
Top Rated Shows
Latest Episode Links
Watch Miami Vice Season 4 Episode 16
Watch Legend of the Seeker Season 2 Episode 10
Watch Community Season 1 Episode 15
Watch My Own Worst Enemy Season 1 Episode 8
Watch Kyle XY Season 3 Episode 10
Watch Kingdom Season 1 Episode 6
Watch Sons of Anarchy Season 2 Episode 13
Watch ReGenesis Season 3 Episode 13
Watch Wildfire Season 4 Episode 13
Watch Greek Season 3 Episode 13
Watch Cops Season 22 Episode 16
Watch K-Ville Season 1 Episode 10
Watch The Real Housewives of Orange County Season 5 Episode 10
Watch Ghost Hunters International Season 2 Episode 10
Watch Kings Season 1 Episode 11
Watch Poker After Dark Season 6 Episode 12
Watch South Park Season 8 Episode 14
Watch Psych Season 4 Episode 15
Watch Modern Family Season 1 Episode 17
Watch Top Gear Season 13 Episode 5
Watch Legend of the Seeker Season 2 Episode 10
Watch Community Season 1 Episode 15
Watch My Own Worst Enemy Season 1 Episode 8
Watch Kyle XY Season 3 Episode 10
Watch Kingdom Season 1 Episode 6
Watch Sons of Anarchy Season 2 Episode 13
Watch ReGenesis Season 3 Episode 13
Watch Wildfire Season 4 Episode 13
Watch Greek Season 3 Episode 13
Watch Cops Season 22 Episode 16
Watch K-Ville Season 1 Episode 10
Watch The Real Housewives of Orange County Season 5 Episode 10
Watch Ghost Hunters International Season 2 Episode 10
Watch Kings Season 1 Episode 11
Watch Poker After Dark Season 6 Episode 12
Watch South Park Season 8 Episode 14
Watch Psych Season 4 Episode 15
Watch Modern Family Season 1 Episode 17
Watch Top Gear Season 13 Episode 5
Most Viewed Shows
TheTvKing Site Sponser