CBS

Season 1: Episode 1 - Pilot

Pilot: Leonard and Sheldon are trying to make some extra cash by visiting a sperm bank for geniuses, but they chicken out and go back to their apartment. When they get home they notice that a very beautiful new neighbor, Penny, has moved in across the hall. They befriend her in the best way they know how: by inviting her over for day-old Indian food. The boys' best friends, Wolowitz and Koothrappali, stop by, and they're equally as challenged with girls. Penny asks the boys for a favor, and they're willing to do whatever she needs. Even if it means going to her ex-boyfriend's place to retrieve her television. Unfortunately for Penny, they come back without the tv, and even more unfortunately for Leonard and Sheldon, they lose their pants as well.