Marlin is an over-protective clown fish father, who desperately searches the sea when his son Nemo goes missing. Marlin's journey leads him beyond the Great Barrier Reef into deeper and darker waters, where he meets Dory, a forgetful yet optimistic blue tang, and a number of not-so-friendly and often very hungry aquatic creatures. Marlin and Dory swim closer to Nemo, but retreaving him will be really tricky.