An overly protective clownfish named Marlin (voice of Albert Brooks) and his son Nemo (voice of Alexander Gould) become separated in the Great Barrier Reef when Nemo is unexpectedly taken far from his ocean home and dumped into a fish tank in a dentist's office.
Buoyed by the companionship of Dory (voice of Ellen DeGeneres), a friendly-but-forgetful Pacific regal blue tang, Marlin embarks on a dangerous trek and finds himself the unlikely hero of an epic effort to rescue his son—who hatches a few daring plans of his own to return safely home.