Nemo, a 6-year-old boy clownfish, is tragically stolen away from the safety of his undersea home at the Great Barrier Reef, ending up in a dentist's office fish tank overlooking Sydney harbor. His timid father, Marlin, Launches a search to find and rescue him, accompanied by a good samaritan, a Regal Blue Tang fish named Dory. Meanwhile, Nemo is hatching a few daring plans of his own to return safely home.