The Big Bang Theory Season 1 Episode 1 : Pilot

After an unsuccessful visit to the high-IQ sperm bank, Leonard (Johnny Galecki) and Sheldon (Jim Parsons) return home to find out Penny (Kaley Cuoco), a new neighbor, has moved in across the hall. Leonard immediately becomes interested in her, while Sheldon feels his friend is chasing a dream he'll never catch. Later, Leonard invites Penny to his and Sheldon's apartment for Indian food where Penny asks to use their shower. While wrapped in a towel she gets to meet their friends Howard Wolowitz (Simon Helberg), a wannabe ladies man, and Rajesh Koothrappali (Kunal Nayyar), who suffers from selective mutism in the presence of attractive women.