Danny Herrera is an overweight, 13-year old misfit from San Francisco, California, whose lazy, bullying uncles decided to send him to Fat Camp for the summer. Instead, Danny gathers his group of unlikely friends and steals a boat in order to have the perfect summer they feel they deserve. Rough seas, ruthless pirates, and a mysterious island turn Danny's pleasure cruise into a dangerous quest for survival he and his friends will never forget. Will this be the last summer for the Castaway Kids?