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- Season 1 overviewSep 24, 2007-May 19, 200817 episodesSeason 1 episodes1. Pilot Sep 24, 2007
- Leonard likes new neighbor Penny, but his roommate thinks he is chasing an impossible dream.
- 2. The Big Bran Hypothesis Oct 1, 2007
- Leonard volunteers to sign for a package, hoping to make a good impression on Penny.
- 3. The Fuzzy Boots Corollary Oct 8, 2007
- Unhappy that Penny is seeing someone, Leonard summons the courage to ask another woman out.
- 4. The Luminous Fish Effect Oct 15, 2007
- Getting fired gives Sheldon the opportunity to explore life beyond physics.
- 5. The Hamburger Postulate Oct 22, 2007
- Leonard, trying to get over Penny, has an unexpected encounter with a fellow scientist.
- 6. The Middle Earth Paradigm Oct 29, 2007
- Leonard, Sheldon, Wolowitz and Koothrappali attend Penny's Halloween party.
- 7. The Dumpling Paradox Nov 5, 2007
- Penny sleeps on Leonard and Sheldon's couch when Wolowitz takes over her apartment.
- 8. The Grasshopper Experiment Nov 12, 2007
- On a blind date, Koothrappali discovers that he can talk to the opposite sex after a few drinks.
- 9. The Cooper-Hofstadter Polarization Mar 17, 2008
- Penny tries to mediate when Sheldon and Leonard disagree about a physics conference.
- 10. The Loobenfeld Decay Mar 24, 2008
- Leonard and Sheldon try to avoid seeing Penny perform after hearing her sing.
- 11. The Pancake Batter Anomaly Mar 31, 2008
- Leonard and the boys avoid Sheldon when he gets sick, leaving Penny to nurse him back to health.
- 12. The Jerusalem Duality Apr 14, 2008
- Sheldon and Leonard look for a way to derail a 15-year-old physics prodigy's research.
- 13. The Bat Jar Conjecture Apr 21, 2008
- The guys kick Sheldon off the Physics Bowl team and bring his nemesis aboard.
- 14. The Nerdvana Annihilation Apr 28, 2008
- Penny tells the guys their obsession with comics and toys is pathetic.
- 15. The Pork Chop Indeterminacy May 5, 2008
- Leonard, Wolowitz and Koothrappali fall for Sheldon's twin sister.
- 16. The Peanut Reaction May 12, 2008
- Penny learns that Leonard does not celebrate birthdays, so she plans a surprise party.
- 17. The Tangerine Factor May 19, 2008
- Leonard finally works up the courage to ask Penny out on a date, and both ask Sheldon for advice.