Surrounded by beautiful tropical marine elements in the region of the Great Barrier Reef a clown fish named Marlin lives in the privacy. He raises his only son Nemo. Ocean and danger existing in it makes Marlin very afraid, and he protects his son from them, but the young Nemo, who suffers from excessive curiosity, is keen to find out more about the mysterious reef, near which they live. When Nemo goes away from home and also faces the threat of becoming dinner of a fish tank, Marlin goes in search of his son. But Marlin, of course, understands that he's not a heroic rescuer and asks for help in search from Dori, a royal blue fish, which, though suffering from not remembering anything, is the kindest creature in the vast ocean! So our heroes go on a journey in which they will have many difficulties and dangers.