Two brilliant young physicists, Leonard Hofstadter and Sheldon Cooper, are the kind of "beautiful minds" that understand how the universe works (this episode reveals that Sheldon and Leonard have a combined IQ of 360 with Leonard having 173 and Sheldon having 187). But their Ph.Ds don't help them interact with people, especially women. All of this is about to change when a free-spirited newly single beauty named Penny moves in next door. When Leonard and Sheldon meet Penny, Leonard is immediately interested in her, saying that their babies will be smart and beautiful, but Sheldon, who feels Leonard's dream is unlikely, says, "Not to mention imaginary".
Sheldon is quite content spending his nights playing Klingon Boggle with their socially dysfunctional friends, fellow geeks Howard Wolowitz, a wannabe ladies man, and Rajesh Koothrappali, who suffers from selective mutism, in particular when Penny is around. However, Leonard sees in Penny a whole new universe of possibilities. He is so infatuated with her that after letting her use their shower on account of hers being broken, he agrees to try and retrieve her TV from her ex-boyfriend, a tall, muscular man named Kurt. However, Kurt depantses Leonard and Sheldon, and they are unable to retrieve the TV. Feeling bad, Penny offers to buy them and their friends dinner.