Title Airs On

S1:E1 Pilot

The Big Bang Theory
09/04/2007 10:10 am EDT

A pair of socially awkward theoretical physicists meet their new neighbor Penny, who is their polar opposite.

S1:E2 The Big Bran Hypothesis

The Big Bang Theory
10/01/2007 10:11 am EDT

Penny is furious with Leonard and Sheldon when they sneak into her apartment and clean it while she is sleeping.

S1:E3 The Fuzzy Boots Corollary

The Big Bang Theory
10/08/2007 10:12 am EDT

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.

S1:E4 The Luminous Fish Effect

The Big Bang Theory
10/15/2007 10:12 am EDT

Sheldon's mother is called to intervene when he delves into numerous obsessions after being fired for being disrespectful to ...read more Sheldon's mother is called to intervene when he delves into numerous obsessions after being fired for being disrespectful to his new boss. show less

S1:E5 The Hamburger Postulate

The Big Bang Theory
10/29/2007 10:13 am EDT

Leslie seduces Leonard, but afterwards tells him that she is only interested in a one-night stand.

S1:E6 The Middle Earth Paradigm

The Big Bang Theory
10/29/2007 10:14 am EDT

The guys are invited to Penny's Halloween party, where Leonard has yet another run-in with Penny's ex-boyfriend Kurt.

S1:E7 The Dumpling Paradox

The Big Bang Theory
11/05/2007 10:15 am EST

When Howard hooks up with Penny's old friend, his absence in the gang causes problems for the rest of the guys.

S1:E8 The Grasshopper Experiment

The Big Bang Theory
11/12/2007 10:16 am EST

When Raj's parents set him up on a blind date, he finds he can talk to women with the aid of alcohol.

S1:E9 The Cooper-Hofstadter Polarization

The Big Bang Theory
03/17/2008 10:16 am EDT

Leonard and Sheldon's friendship is put to the test when Leonard wants to present a paper they co-authored at a physics ...read more 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. show less

S1:E10 The Loobenfeld Decay

The Big Bang Theory
03/24/2008 10:17 am EDT

Leonard lies to Penny so that he and Sheldon can get out of watching her perform. However, Sheldon believes that the lie has too ...read more 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. show less

S1:E11 The Pancake Batter Anomaly

The Big Bang Theory
03/31/2008 10:18 am EDT

When Sheldon gets sick, Leonard, Howard and Raj go AWOL, leaving a reluctant Penny to deal with him.

S1:E12 The Jerusalem Duality

The Big Bang Theory
04/14/2008 10:19 am EDT

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 ...read more 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. show less

S1:E13 The Bat Jar Conjecture

The Big Bang Theory
04/21/2008 10:20 am EDT

Sheldon becomes so intent on demonstrating his intellectual superiority over the other guys that they kick him off the Physics ...read more 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. show less

S1:E14 The Nerdvana Annihilation

The Big Bang Theory
04/28/2008 10:20 am EDT

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 ...read more 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. show less

S1:E15 The Pork Chop Indeterminacy

The Big Bang Theory
05/05/2008 10:21 am EDT

Leonard, Howard and Raj fight over Sheldon's twin sister when she arrives in town. Raj takes part in a drug trial to ...read more 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. show less

S1:E16 The Peanut Reaction

The Big Bang Theory
05/12/2008 10:22 am EDT

When Penny learns that Leonard has never had a birthday party, she and the rest of the guys plan a surprise party for him.

S1:E17 The Tangerine Factor

The Big Bang Theory
05/19/2008 10:22 am EDT

After a bad breakup, Penny finally agrees to go out on a date with Leonard, however they both develop doubts and turn to Sheldon ...read more After a bad breakup, Penny finally agrees to go out on a date with Leonard, however they both develop doubts and turn to Sheldon for advice. show less