 | 1x01 Pilot (Air Date: Sep. 24, 2007)
Sheldon and Leonard are two brilliant, but socially inept theoretical physicists who share an apartment. In the series premier, they meet their new neighbor, Penny, a stereotypical beautiful ... |  | 1x02 The Big Bran Hypothesis (Air Date: Oct. 01, 2007)
Leonard agrees to sign for a package for Penny, but when it turns out to be a massive unassembled entertainment unit, he and Sheldon must muscle the box up several flights of stairs - a ... |  | 1x03 The Fuzzy Boots Corollary (Air Date: Oct. 08, 2007)
Leonard is crushed when he sees Penny kissing another man in the hallway. Faced with the bleak reality of his chances with Penny, he turns his affections toward Leslie, a fellow scientist ... |  | 1x04 The Luminous Fish Effect (Air Date: Oct. 15, 2007)
When Sheldon is fired, he tries to explore life outside the university. He goes food shopping with Penny, who is less than enthusiastic, and then conducts several scientific experiements ... |  | 1x05 The Hamburger Postulate (Air Date: Oct. 22, 2007)
Leslie invites Leonard to play cello in a musical ensemble, but they have to practice at the guys' apartment. Once practice is over, Leslie quickly seduces Leonard for a sexual encounter.Having ... |  | 1x06 The Middle Earth Paradigm (Air Date: Oct. 29, 2007)
When the guys are invited to Penny's Halloween party, Leonard sees it as an opportunity to get to know her friends and thereby get closer to her, but when her ex-boyfriend arrives, those ... |  | 1x07 The Dumpling Paradox (Air Date: Nov. 05, 2007)
Wolowitz seduces a friend of Penny's. As they have taken over Penny's apartment, Penny is forced to sleep on Leonard and Sheldon's couch. The guys are also short one member on their HALO ... |  | 1x08 The Grasshopper Experiment (Air Date: Nov. 12, 2007)
Koothrappali is overwhelmed after his parents arrange a blind date, but he discovers he actually can talk to the opposite sex after a few drinks; however, complications set in when his beautiful ... |  | 1x09 The Cooper-Hofstadter Polarization (Air Date: Mar. 17, 2008)
Sheldon and Leonard are asked to present their work at a physics conference together, but a fight ensues when Sheldon refuses to share the honor. When Penny steps in to mediate, things only ... |  | 1x10 The Loobenfeld Decay (Air Date: Mar. 24, 2008)
Leonard tells Penny a lie so that he doesn't have to hear her sing again, while Sheldon widens the lie, which makes Leonard in need to produce a phony cousin. |  | 1x11 The Pancake Batter Anomaly (Air Date: Mar. 31, 2008)
Penny nurses a sick Sheldon back to health, unaware that the guys refuse to do so because he makes such a lousy patient. |  | 1x12 The Jerusalem Duality (Air Date: Apr. 14, 2008)
Leonard and Sheldon meet a 15-year-old physics prodigy and Sheldon is thrown off that the boy is younger and smarter than himself. This leads the boys to try to come up with a way to restore ... |  | 1x13 The Bat Jar Conjecture (Air Date: Apr. 21, 2008)
Sheldon finds himself out of the gang's Physics Bowl team and replaced with Leslie. Not taking this sitting down, Sheldon decides to start a team of his own to prove that he's the best out ... |  | 1x14 The Nerdvana Annihilation (Air Date: Apr. 28, 2008)
Leonard and the gang buy a time machine prop that was used in a classic 1960s movie. However, their thrill over having a replica time machine is shot down when Penny tells them that their ... |  | 1x15 The Pork Chop Indeterminacy (Air Date: May. 05, 2008)
The guys fight for Sheldon's twin sister when she arrives for a visit, but Leonard has a plan to get rid his rivals. Sheldon becomes her protector and decides he will pick out who she will ... |  | 1x16 The Peanut Reaction (Air Date: May. 12, 2008)
Penny throws Leonard a surprise party after discovering that he doesn't celebrate birthday's, but becomes sidetracked by Sheldon, who, while at an electronics store, gets to live out one ... |  | 1x17 The Tangerine Factor (Air Date: May. 19, 2008)
Leonard and Penny each seek a reluctant adviser, Sheldon, for a bit of wisdom concerning their date with each other. |
 | 2x01 The Bad Fish Paradigm (Air Date: Sep. 22, 2008)
Penny and Leonard go on a date, but when their night out goes awry, Penny finds a friend in Sheldon. |  | 2x02 The Codpiece Topology (Air Date: Sep. 29, 2008)
Leonard begins dating Sheldon's nemesis, Leslie Winkle, after seeing Penny with a handsome new guy. |  | 2x03 The Barbarian Sublimination (Air Date: Oct. 06, 2008)
Penny is introduced to online gaming by Sheldon, and she quickly becomes addicted. |  | 2x04 The Griffin Equivalency (Air Date: Oct. 13, 2008)
Raj gets a swelled head and goes after Leonard's new crush, Penny, after being made famous in a magazine article leading to a disastrous result. |  | 2x05 The Euclid Alternative (Air Date: Oct. 20, 2008)
Leonard and his friends want to help Sheldon overcome his fear of driving with an intervention. |  | 2x06 The Cooper-Nowitzki Theorem (Air Date: Nov. 03, 2008)
Sheldon, as well as the others, are baffled when a young grad student begins to fall for him. |  | 2x07 The Panty Pińata Polarization (Air Date: Nov. 10, 2008)
Sheldon, as well as the others, are baffled when a young grad student begins to fall for him. |  | 2x08 The Lizard-Spock Expansion (Air Date: Nov. 17, 2008)
Has a smitten Wolowitz found the love of his life, he thinks so until she meets Leonard. |  | 2x09 The White Asparagus Triangulation (Air Date: Nov. 24, 2008)
Sheldon puts all his efforts to make Leonard's relationship with Stephanie, work. |  | 2x10 The Vartabedian Conundrum (Air Date: Dec. 08, 2008)
Leonard ask for advice from Penny when his relationship with Stephanie begins moving too fast for him. |  | 2x11 The Bath Item Gift Hypothesis (Air Date: Dec. 15, 2008)
Leonard finds no comfort and joy at Christmas time, as his colleague begins dating Penny. Meanwhile, Sheldon's adherence to gift-giving etiquette is driving everyone nuts. |  | 2x12 The Killer Robot Instability (Air Date: Jan. 12, 2009)
Wolowitz leaves his friends in a bind when he drops out of an upcoming robot competition after becoming depressed when due to Penny's comment on his love life. |  | 2x13 The Friendship Algorithm (Air Date: Jan. 19, 2009)
The boys discover a conundrum which is baffling: The very source of Sheldon's social awkwardness seems to be his intelligence, is also the reason according to his new scientific procedure ... | | 2x14 The Financial Permeability (Air Date: Feb. 02, 2009)
Penny receives help from Sheldon over her financial crisis, but causes Penny's burly ex-boyfriend, Kurt, to have a confrontation with Sheldon. |  | 2x15 The Maternal Capacitance (Air Date: Feb. 09, 2009)
Penny and Leonard turn to each other and tequila for comfort after suffering a dreadful visit from his mother. |  | 2x16 The Cushion Saturation (Air Date: Mar. 02, 2009)
A paintball game sparks a fight between Penny and Sheldon, and leads to romance for Wolowitz and Leslie. |  | 2x17 The Terminator Decoupling (Air Date: Mar. 09, 2009)
Leonard, Sheldon, Wolowitz and Raj take a train trip to San Francisco and can hardly believe beautiful sci-fi actress Summer Glau is onboard. | | 2x18 The Work Song Nanocluster (Air Date: Mar. 16, 2009)
When Penny's friends, especially Sheldon, get involved in her new hair product business, it quickly suffers. | | 2x19 The Dead Hooker Juxtaposition (Air Date: Mar. 30, 2009)
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny." | | 2x20 The Hofstadter Isotope (Air Date: Apr. 13, 2009)
While at a comic book store, Penny is romanced by a friend of the guys'. Meanwhile, Leonard and Wolowitz head to a bar for ladies night in hope of finding women. | | 2x21 The Vegas Renormalization (Air Date: Apr. 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 (Air Date: May. 04, 2009)
Penny makes an unexpected discovery concerning Leonard, while on a date with Stuart. Meanwhile, a design flaw in his NASA project finds Wolowitz needing some help from his friends. | | 2x23 The Monopolar Expedition (Air Date: May. 11, 2009)
Leonard packs his bags for a three-month long science trip, and he and Penny talk about their feelings for each other in the second-season finale. |
| 3x01 The Electric Can Opener Fluctuation (Air Date: Sep. 21, 2009)
Discovering that Leonard, Raj, and Howard fudged the results of his Arctic research expedition, a disgraced Sheldon heads home to Texas. | | 3x02 The Jimmy Conjecture (Air Date: Sep. 28, 2009)
Sheldon and Howard wager comic books over a cricket's species. Meanwhile, a less-than-perfect romantic night agonizes Leonard and Penny. | | 3x03 The Gothowitz Deviation (Air Date: Oct. 05, 2009)
Howard takes Raj along to check out the Goth dating scene. Sheldon uses chocolate as part of a behavior modification experiment on Penny. | | 3x04 The Pirate Solution (Air Date: Oct. 12, 2009)
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. |  | 3x05 The Creepy Candy Coating Corollary (Air Date: Oct. 19, 2009)
Sheldon looks forward to squaring off against the the one actor from the Star Trek universe he holds enmity towards—Wil Wheaton—in a fantasy collectable card game tournament. Wolowitz ... |  | 3x06 The Cornhusker Vortex (Air Date: Nov. 02, 2009)
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 pat ... |  | 3x07 The Guitarist Amplification (Air Date: Nov. 09, 2009)
A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism. |  | 3x08 The Adhesive Duck Deficiency (Air Date: Nov. 16, 2009)
Penny is injured, but unfortunately Leonard, Howard and Raj are all away on a camping trip to the desert, so all she has to rely on is Sheldon. | | 3x09 The Vengeance Formulation (Air Date: Nov. 23, 2009)
While Wolowitz does everything he can do to make his new relationship with Bernadette work, Sheldon vows to destroy Kripke after being humiliated on National Public Radio. | | 3x10 TBA (Air Date: Dec. 07, 2009)
[add summary] | | 3x11 TBA (Air Date: Dec. 14, 2009)
[add summary] |
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