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SignupThe Big Bang Theory
Still airing- Started airing: 2007
- Seasons: 4
- Episodes: 64 (Avg. 16 per season)
- Followers: 599
Season 4 |
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Episode |
Air date |
Score |
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4x1: The Robotic Manipulation
The Robotic Manipulation (4x1)Howard uses a robotic arm for his own pleasure. Penny assists Sheldon with his first date. |
September 24th, 2010 |  (0.0) |
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Season 3 |
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Episode |
Air date |
Score |
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3x1: The Electric Can Opener Fluctuation
The Electric Can Opener Fluctuation (3x1)Discovering that Leonard, Raj, and Howard fudged the results of his Arctic research expedition, a disgraced Sheldon heads home to Texas. |
September 22nd, 2009 |  (8.1) |
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3x2: The Jiminy Conjecture
The Jiminy Conjecture (3x2)Sheldon and Howard wager comic books over a cricket's species. Meanwhile, a less-than-perfect romantic night agonizes Leonard and Penny. |
September 29th, 2009 | (8.0) |
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3x3: The Gothowitz Deviation
The Gothowitz Deviation (3x3)Howard takes Raj along to check out the Goth dating scene. Sheldon uses chocolate as part of a behavior modification experiment on Penny. |
October 6th, 2009 | (8.1) |
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3x4: The Pirate Solution
The Pirate Solution (3x4)Facing a return to India, Raj needs a job desperately enough to consider working for Sheldon. Meanwhile, Howard becomes a third wheel to Leonard and Penny. |
October 13th, 2009 | (8.1) |
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3x5: The Creepy Candy Coating Corollary
The Creepy Candy Coating Corollary (3x5)Sheldon looks forward to squaring off against the the one actor from the <em>Star Trek</em> universe he holds enmity towards—Wil Wheaton—in a fantasy collectable card game tournament. Wolowitz cashes in on an old pact with Leonard to get Penny to set him up with a friend of hers. |
October 20th, 2009 |  (8.4) |
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3x6: The Cornhusker Vortex
The Cornhusker Vortex (3x6)Leonard, hoping to fit in with Penny's football-loving friends, gets tutored in the sport by Sheldon. Raj is infuriated when Wolowitz's skirt-chasing leads to the loss of his prized patang. |
November 3rd, 2009 | (7.4) |
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3x7: The Guitarist Amplification
The Guitarist Amplification (3x7)Leonard and Penny's first big fight sees Sheldon playing mediator due to childhood trauma that's left him with an inability to be around loud verbal conflicts. |
November 10th, 2009 | (8.1) |
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3x8: The Adhesive Duck Deficiency
The Adhesive Duck Deficiency (3x8)With the rest of the gang off on a desert camping trip to view the Leonid meteor shower, Sheldon must play hero after Penny slips in the tub and dislocates her shoulder. |
November 17th, 2009 | (8.1) |
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3x9: The Vengeance Formulation
The Vengeance Formulation (3x9)Barry Kripke pranks Sheldon during his spot on NPR, leaving him with a taste for vengeance. Wolowitz, pressured by Bernadette to define their relationship, gets advice from a fantasy version of Katee Sackhoff. |
November 24th, 2009 | (8.1) |
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3x10: The Gorilla Experiment
The Gorilla Experiment (3x10)Penny seeks Sheldon's help to better comprehend Leonard's physics work. Wolowitz sees green when Leonard invites Bernadette to watch an experiment. |
December 8th, 2009 | (8.1) |
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3x11: The Maternal Congruence
The Maternal Congruence (3x11)A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon and worrying if she'll approve of his romance with Penny. |
December 15th, 2009 | (8.1) |
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3x12: The Psychic Vortex
The Psychic Vortex (3x12)Leonard is aghast to find out a secret of Penny's: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university party. |
January 12th, 2010 | (8.1) |
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3x13: The Bozeman Reaction
The Bozeman Reaction (3x13)A robbery of their apartment sees Leonard and Sheldon call on their friends to devise a security system. |
January 19th, 2010 | (8.1) |
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3x14: The Einstein Approximation
The Einstein Approximation (3x14)Stuck on the solution to a physics problem, Sheldon seeks a number of alternative approaches to change his thinking and free the mental block—including working with Penny at The Cheesecake Factory. |
February 2nd, 2010 | (8.1) |
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3x15: The Large Hadron Collision
The Large Hadron Collision (3x15)Leonard faces a dilemma in choosing between Sheldon or Penny to accompany him to Switzerland to see CERN's Large Hadron Collider on Valentine's Day. |
February 9th, 2010 | (8.0) |
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3x16: The Excelsior Acquisition
The Excelsior Acquisition (3x16)An appearance in traffic court comes at the worst possible time for Sheldon—the same day Stan Lee is appearing at the comic book store. |
March 2nd, 2010 | (7.4) |
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3x17: The Precious Fragmentation
The Precious Fragmentation (3x17)The discovery of a prop ring from <em>The Lord of the Rings</em> movies puts a strain on the guys' friendship. |
March 9th, 2010 | (7.7) |
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3x18: The Pants Alternative
The Pants Alternative (3x18)Sheldon's fear of speaking in front of large groups threatens his ability to accept an award, so the gang tries to help him get ready for the big night. |
March 23rd, 2010 | (8.1) |
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3x19: The Wheaton Recurrence
The Wheaton Recurrence (3x19)Sheldon gets to square off on the bowling alley against nemesis Wil Wheaton. Meanwhile, Leonard's miffed when Penny doesn't respond the way he hoped after saying, "I love you." |
April 13th, 2010 | (8.0) |
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3x20: The Spaghetti Catalyst
The Spaghetti Catalyst (3x20)Subsequent to Leonard and Penny's break-up, Sheldon tries to hide from Leonard and the gang that he had a friendly spaghetti dinner at Penny's. |
May 4th, 2010 | (8.1) |
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3x21: The Plimpton Stimulation
The Plimpton Stimulation (3x21)Sheldon hosts a visiting female physicist, but her intelligence seems matched by her libido. |
May 11th, 2010 | (8.1) |
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3x22: The Staircase Implementation
The Staircase Implementation (3x22)A squabble over the thermostat setting leads to Leonard going over to Penny's and recounting for her the story of how he met and moved in with Sheldon. |
May 18th, 2010 | (7.9) |
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3x23: The Lunar Excitation
The Lunar Excitation (3x23)Howard and Raj try to find the perfect match for Sheldon by setting him up on an Internet dating site. Seeing her moronic new boyfriend interact with the gang makes it abundantly clear to Penny that she can't go back to dating stereotypical dumb jocks after dating Leonard. |
May 25th, 2010 | (7.0) |
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Season 2 |
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Episode |
Air date |
Score |
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2x1: The Bad Fish Paradigm
The Bad Fish Paradigm (2x1)Penny opens up to a reluctant Sheldon after a less-than-stellar first date with Leonard, placing him in the uncomfortable position of having to keep a secret. |
September 23rd, 2008 | (8.4) |
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2x2: The Codpiece Topology
The Codpiece Topology (2x2)Seeing Penny with another guy sends Leonard back to Leslie Winkle, much to Sheldon's dismay. |
September 30th, 2008 | (8.4) |
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2x3: The Barbarian Sublimation
The Barbarian Sublimation (2x3)Penny becomes addicted to an online game based on the world of Conan the Barbarian and persistantly pesters Sheldon for advice. |
October 7th, 2008 | (8.4) |
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2x4: The Griffin Equivalency
The Griffin Equivalency (2x4)Full of confidence following being named one of <em>People</em>'s "30 to Watch Under 30", Raj hits on Penny and becomes impossibly arrogant. |
October 14th, 2008 | (8.4) |
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2x5: The Euclid Alternative
The Euclid Alternative (2x5)An intervention is used to try to force Sheldon to overcome his fear of driving. |
October 21st, 2008 | (8.5) |
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2x6: The Cooper-Nowitzki Theorem
The Cooper-Nowitzki Theorem (2x6)Sheldon, and his friends, are mystified when a younger undergraduate student is attracted to him. |
November 4th, 2008 | (8.6) |
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2x7: The Panty Piñata Polarization
The Panty Piñata Polarization (2x7)When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate. Howard and Raj search for the <em>America's Next Top Model</em> house. |
November 11th, 2008 | (8.5) |
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2x8: The Lizard-Spock Expansion
The Lizard-Spock Expansion (2x8)Sheldon wants to use an alternate version of rock-paper-scissors to help resolve conflicts. A girl Wolowitz has a major crush on falls for Leonard. |
November 18th, 2008 | (8.4) |
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2x9: The White Asparagus Triangulation
The White Asparagus Triangulation (2x9)Sheldon is overexuberant that Leonard finally has a girlfriend matching his high standards. |
November 25th, 2008 | (8.3) |
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2x10: The Vartabedian Conundrum
The Vartabedian Conundrum (2x10)Leonard seeks Penny's counsel when his relationship with Stephanie takes off faster than he'd like. Sheldon's hypochondriac tendencies get the better of him. |
December 9th, 2008 | (8.1) |
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2x11: The Bath Item Gift Hypothesis
The Bath Item Gift Hypothesis (2x11)Sheldon irks the gangs with his obession with proper Christmas gift protocol. Lenoard's crushed when Penny dates a colleague of his. |
December 16th, 2008 | (7.9) |
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2x12: The Killer Robot Instability
The Killer Robot Instability (2x12)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. |
January 13th, 2009 | (8.1) |
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2x13: The Friendship Algorithm
The Friendship Algorithm (2x13)Looking to get friendly with Barry Kripke to gain access to a piece of high-tech lab equipment, Sheldon develops a flowchart process to make friends. |
January 20th, 2009 | (6.9) |
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2x14: The Financial Permeability
The Financial Permeability (2x14)When Sheldon loans money to Penny so she can pay her rent, it leads to Leonard coming face-to-face with her ex, Kurt. |
February 3rd, 2009 | (8.2) |
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2x15: The Maternal Capacitance
The Maternal Capacitance (2x15)A visit from Leonard's mother ends up bringing him and Penny closer. |
February 10th, 2009 | (8.6) |
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2x16: The Cushion Saturation
The Cushion Saturation (2x16)Paintball leads to a squabble between Sheldon and Penny, as well as romance between Howard and Leslie. |
March 3rd, 2009 | (8.1) |
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2x17: The Terminator Decoupling
The Terminator Decoupling (2x17)The gang is thrilled when they see <em>Terminator: The Sarah Connor Chronicles</em>' Summer Glau is also aboard their train to San Francisco for a scientific symposium. Meanwhile, Sheldon frets over having forgotten a paper he wants to present to George Smoot. |
March 10th, 2009 | (8.3) |
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2x18: The Work Song Nanocluster
The Work Song Nanocluster (2x18)Penny's business selling hair accessories out of her apartment gets out of hand when an over-caffeinated Sheldon takes charge. |
March 17th, 2009 | (8.3) |
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2x19: The Dead Hooker Juxtaposition
The Dead Hooker Juxtaposition (2x19)Penny feels threatened when another sexy woman moves into the apartment building and angered when she senses the guys are being taken advantage of. |
March 31st, 2009 | (8.1) |
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2x20: The Hofstadter Isotope
The Hofstadter Isotope (2x20)A fellow comic book enthusiast's hitting on Penny leads to Leonard, Raj, and Howard going to a bar's Ladies' Night. |
April 14th, 2009 | (8.1) |
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2x21: The Vegas Renormalization
The Vegas Renormalization (2x21)Leonard and Raj take Wolowitz to Las Vegas to help him get over his break-up with Leslie. Sheldon, home alone and looking forward to it, locks himself out and has only one other place to stay—Penny's. |
April 28th, 2009 | (8.5) |
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2x22: The Classified Materials Turbulence
The Classified Materials Turbulence (2x22)Leonard is torn between being honest or self-serving when Stuart asks his advice for an upcoming second date with Penny. Wolowitz realizes there's a crucial error in a toilet he designed for the International Space Station. |
May 5th, 2009 | (8.2) |
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2x23: The Monopolar Expedition
The Monopolar Expedition (2x23)The guys' prestigious offer to work over the summer at the North Pole—and Penny's resultant behavior—leaves Leonard unsure if he should go. |
May 12th, 2009 | (8.5) |
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Season 1 |
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Episode |
Air date |
Score |
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1x1: Pilot
Pilot (1x1)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. |
September 25th, 2007 | (8.9) |
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1x2: The Big Bran Hypothesis
The Big Bran Hypothesis (1x2)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. |
October 2nd, 2007 | (9.1) |
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1x3: The Fuzzy Boots Corollary
The Fuzzy Boots Corollary (1x3)Leonard asks a woman out after he finds out that Penny is seeing someone. |
October 9th, 2007 | (8.9) |
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1x4: The Luminous Fish Effect
The Luminous Fish Effect (1x4)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. |
October 16th, 2007 | (9.0) |
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1x5: The Hamburger Postulate
The Hamburger Postulate (1x5)Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie. Meanwhile, Sheldon frets over a change to his hamburger routine. |
October 23rd, 2007 | (9.1) |
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1x6: The Middle Earth Paradigm
The Middle Earth Paradigm (1x6)Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz, and Koothrappali through a new test of their social skills. |
October 30th, 2007 | (9.3) |
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1x7: The Dumpling Paradox
The Dumpling Paradox (1x7)With Wolowitz AWOL with one of her friends, Penny's recruited to fill in for him on the guys' <i>Halo</i> team. |
November 6th, 2007 | (9.3) |
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1x8: The Grasshopper Experiment
The Grasshopper Experiment (1x8)Raj's parents set him up on a blind date, and when he discovers he can talk to her, she shows interest in Sheldon. |
November 13th, 2007 | (9.3) |
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1x9: The Cooper-Hofstadter Polarization
The Cooper-Hofstadter Polarization (1x9)When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between him and Leonard, and Penny's intervention only exacerbates the situation. |
March 18th, 2008 | (9.3) |
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1x10: The Loobenfeld Decay
The Loobenfeld Decay (1x10)Leonard and Sheldon each lie to avoid hearing Penny sing in a production of <i>Rent</i>. However, Sheldon's lie becomes a bit too complicated for its own good. |
March 25th, 2008 | (9.0) |
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1x11: The Pancake Batter Anomaly
The Pancake Batter Anomaly (1x11)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. |
April 1st, 2008 | (9.3) |
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1x12: The Jerusalem Duality
The Jerusalem Duality (1x12)With Sheldon rattled and impossible to be around after meeting Dennis, a 15-year-old physicist who's smarter than he, the rest of the guys search for a way to eliminate the threat. |
April 15th, 2008 | (9.1) |
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1x13: The Bat Jar Conjecture
The Bat Jar Conjecture (1x13)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. |
April 22nd, 2008 | (9.2) |
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1x14: The Nerdvana Annihilation
The Nerdvana Annihilation (1x14)When the delivery of a full-size prop of 1960's <i>The Time Machine</i> makes Penny miss work, she scolds Leonard about his sci-fi collectibles. He decides it's time to give up such childish pursuits. |
April 29th, 2008 | (9.2) |
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1x15: The Pork Chop Indeterminacy
The Pork Chop Indeterminacy (1x15)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. |
May 6th, 2008 | (9.3) |
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1x16: The Peanut Reaction
The Peanut Reaction (1x16)Penny wants to throw a surprise party for Leonard, but Sheldon's indulgence at an electronics store throws her off-track. |
May 13th, 2008 | (9.4) |
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1x17: The Tangerine Factor
The Tangerine Factor (1x17)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. |
May 20th, 2008 | (9.5) |
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