 Marlin (a clown fish) is a widower who only has his son Nemo left of his family after a predator attack. Years later, on Nemo s first day of school, he s captured by a scuba diver and taken to live in a dentist office s fish tank. Marlin and his new absent-minded friend Dory set off across the ocean to find Nemo, while Nemo and his tankmates scheme on how to get out of the tank before he becomes the dentist s niece s new pet.