The Big Bang Theory episodes
The Big Bang Theory
(2007 - Present) on CBSSeason 2 Episode Guide
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Season 2, Episode 1 | September 22nd, 2008 The Bad Fish Paradigm
After Penny and Leonard's great date, Leonard tries to kiss Penny in the hallway and realizes that the guys have secretly rigged cameras to spy on them. Penny then tells him that they should take things... more
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Season 2, Episode 2 | September 29th, 2008 The Codpiece Topology
Leonard and Penny are no longer dating. Leslie Winkle, played by Sarah Gilbert, moves in on Leonard and proposes to revisit their relationship. Leonard kicks Sheldon out of their apartment so he and Leslie... more
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Season 2, Episode 3 | October 6th, 2008 The Barbarian Sublimation
Penny feels frustrated by her failure at everything in her life. She becomes obsessed with playing an online game called "The Age of Conan," and Sheldon tries to help with her addiction by giving her tips... more
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Season 2, Episode 4 | October 13th, 2008 The Griffin Equivalency
Koothrappali is being honored by People Magazine's "30 under 30" for his discovery of a new planet. The guys all try to express their support and happiness for him except for Sheldon who can't understand... more
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Season 2, Episode 5 | October 20th, 2008 The Euclid Alternative
Leonard needs to work nights, leaving Sheldon without a ride to or from work. He asks Penny, then Wolowitz, then Koothrappali, but one way or another, he manages to annoy them to the point they won't drive... more
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Season 2, Episode 6 | November 3rd, 2008 The Cooper-Nowitzki Theorem
After speaking at a student seminar, Sheldon finds himself with a groupie named Ramona Nowitzki. She’s young and beautiful and prepared to do anything for Sheldon so he can focus entirely on his work.... more
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Season 2, Episode 7 | November 10th, 2008 The Panty Pinata Polarization
Penny is now a member of Leonard and Sheldon's group, so she must obey the house rules. After her third strike, Sheldon banishes her. Leonard gets frustrated with Sheldon about this because he and Penny... more
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Season 2, Episode 8 | November 17th, 2008 The Lizard-Spock Expansion
Leonard, Sheldon and Koothrappali are using Rock-Paper-Scissors-Lizard-Spock to decide what to watch on TV when they're interrupted by a phone call from Wolowitz. Wolowitz has picked up a woman, Stephanie,... more
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Season 2, Episode 9 | November 24th, 2008 The White Asparagus Triangulation
Leonard continues to date Stephanie and things seem to be going well as far as he's concerned. Sheldon, however, is worried that Leonard isn't handling things correctly; Sheldon really likes Stephanie... more
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Season 2, Episode 10 | December 8th, 2008 The Vartabedian Conundrum
Penny councils Leonard about his relationship with Stephanie when he realizes that the only reason he is dating her is that she likes him. He tries to break it off, but each time he tries they end up having... more
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Season 2, Episode 11 | December 15th, 2008 The Bath Item Gift Hypothesis
Leonard meets his intellectual superior in award winning scientist David Underhill. Underhill is the total opposite of Leonard: handsome, charming, and cool. He's the whole package of brains and looks... more
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Season 2, Episode 12 | January 12th, 2009 The Killer Robot Instability
The guys are excited about building a “killer” robot named Monte for a regional robot fighting league when Kripke challenges them to a robot duel which Sheldon jumps at. The duel goes awry and Monte... more
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Season 2, Episode 13 | January 19th, 2009 The Friendship Algorithm
Sheldon needs to use a new super computer that has just arrived at the University but when Leonard informs him that Kripke controls who can use the computer and he only allows his friends to use it, Sheldon... more
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Season 2, Episode 14 | February 2nd, 2009 The Financial Permeability
When Penny runs into financial trouble, Sheldon gladly offers to lend her money. Penny is uncomfortable with taking money from him and begins to act out her frustration which confuses Sheldon entirely.... more
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Season 2, Episode 15 | February 9th, 2009 The Maternal Capacitance
Leonard’s mother (played by Christine Baranski), a brilliant neuroscientist who has no concept of appropriate human interaction or warmth, comes for a visit. During her stay, she manages to alienate... more
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Season 2, Episode 16 | March 2nd, 2009 The Cushion Saturation
Wolowitz begins to date Leslie (played by Sara Gilbert) with Leonard’s blessing. Leslie has access to unrestricted grant money that she is using towards Wolowitz's research while the other guys are having... more
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Season 2, Episode 17 | March 9th, 2009 The Terminator Decoupling
The guys are going to attend a symposium featuring Dr. George Smoot (Nobel Laureate for his work on the Big Bang) in San Francisco. Sheldon decides for the group that the train is the best way to travel... more
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Season 2, Episode 18 | March 16th, 2009 The Work Song Nanocluster
Sheldon helps Penny start her own business making hair clips. Leonard and the rest of the guys pitch in to start a website and manufacture her goods. The website is pretty lame -- and they are tease Leonard... more
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Season 2, Episode 19 | March 30th, 2009 The Dead Hooker Juxtaposition
Penny has become one of the guys around our guys. She dresses in sweats -- hair in a pony tail -- and she is not at all prepared when a new, very hot girl moves into the building. Leonard, Koothrapali... more
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Season 2, Episode 20 | April 13th, 2009 The Hofstadter Isotope
In this episode Penny is hit on by the sales clerk in a comic book store that the guys frequent. Leonard is devastated at this turn of events. He can't believe that Penny would date one of "them" if it... more
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Season 2, Episode 21 | April 27th, 2009 The Vegas Renormalization
When Wolowitz is dumped by Leslie Winkle, the guys take him to Vegas. He hides in his room the whole time looking at Leslie's Facebook page. The guys finally lure him out with a prostitute. In the mean... more
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Season 2, Episode 22 | May 4th, 2009 The Classified Materials Turbulence
Stuart, played by Kevin Sussman, the comic book sales clerk goes to Leonard to ask his advice on dating Penny. Leonard advises him to act very shy around Penny. Leonard later finds out that Stuart's date... more
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Season 2, Episode 23 | May 11th, 2009 The Monopolar Expedition
Sheldon is approached by the Dean of the University to lead a scientific expedition to the Arctic. He invites the guys to go along with him for the summer and be his team. After much banter about how difficult... more
