Battle of the Bands: Grim becomes the lead singer of a goth metal band, Purple Filth. A jealous Billy recruits his dad to teach him how to compete in the Battle of the Bands competition. | Little Rock of Horror: Billy befriends a giant brain-eating meteor in his backyard. | Dream a Little Dream: Grim, Billy and Mandy eat some bad pizza, resulting in a series of bizarre and mind-bending dreams.