The Big Bang Theory (2007–2019)
1 May 2006Unaired Pilot
The first Pilot of what will become "The Big Bang Theory". Leonard and Sheldon are two awkward scientists who share an apartment. They meet a drunk girl called Katie and invite her to stay at their place, because she has nowhere to stay. The two guys have a female friend, also a scientist, called Gilda.
24 Sep. 2007Pilot
A pair of socially awkward theoretical physicists meet their new neighbor Penny, who is their polar opposite.
1 Oct. 2007The Big Bran Hypothesis
Penny is furious with Leonard and Sheldon when they sneak into her apartment and clean it while she is sleeping.
8 Oct. 2007The Fuzzy Boots Corollary
Leonard gets upset when he discovers that Penny is seeing a new guy, so he tries to trick her into going on a date with him.
15 Oct. 2007The Luminous Fish Effect
Sheldon's mother is called to intervene when he delves into numerous obsessions after being fired for being disrespectful to his new boss.
22 Oct. 2007The Hamburger Postulate
Leslie seduces Leonard, but afterwards tells him that she is only interested in a one-night stand.
29 Oct. 2007The Middle Earth Paradigm
The guys are invited to Penny's Halloween party, where Leonard has yet another run-in with Penny's ex-boyfriend Kurt.
5 Nov. 2007The Dumpling Paradox
When Howard hooks up with Penny's old friend, his absence in the gang causes problems for the rest of the guys.
12 Nov. 2007The Grasshopper Experiment
When Raj's parents set him up on a blind date, he finds he can talk to women with the aid of alcohol.
17 Mar. 2008The Cooper-Hofstadter Polarization
Leonard and Sheldon's friendship is put to the test when Leonard wants to present a paper they co-authored at a physics convention, but Sheldon doesn't.
24 Mar. 2008The Loobenfeld Decay
Leonard lies to Penny so that he and Sheldon can get out of watching her perform. However, Sheldon believes that the lie has too many loose ends, so he comes up with a new, unnecessarily complex one to replace it.
31 Mar. 2008The Pancake Batter Anomaly
When Sheldon gets sick, Leonard, Howard and Raj go AWOL, leaving a reluctant Penny to deal with him.
14 Apr. 2008The Jerusalem Duality
Sheldon decides to give up his work and focus on other tasks when a 15-year-old prodigy joins the university, so the other guys come up with a plan to get rid of him.
21 Apr. 2008The Bat Jar Conjecture
Sheldon becomes so intent on demonstrating his intellectual superiority over the other guys that they kick him off the Physics Bowl team and replace him with his nemesis, Leslie.
28 Apr. 2008The Nerdvana Annihilation
Penny gets mad at the guys when their full scale model of a time machine causes her to miss work, which prompts Leonard to give up all of his nerd memorabilia.
5 May 2008The Pork Chop Indeterminacy
Leonard, Howard and Raj fight over Sheldon's twin sister when she arrives in town. Raj takes part in a drug trial to suppress his selective mutism.
12 May 2008The Peanut Reaction
When Penny learns that Leonard has never had a birthday party, she and the rest of the guys plan a surprise party for him.
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