iCarly's biggest fan, Mandy Valdez, becomes the show's first one-kid live audience. However, she begins following the cast incessantly and refuses to leave them alone, which annoys the trio. They try to find out how to get her to stop. Meanwhile, Spencer gets to be a drummer for a rock band, but discovers that the band was using him to play in his house. In the end, Mandy falls for the band, after they dump Spencer, and drives the band insane.