Nemo, an adventurous young clownfish, is unexpectedly captured from Australia's Great Barrier Reef and taken to a dentist's office aquarium. It's up to Marlin, his worrisome father, and Dory, a friendly but forgetful regal blue tang fish, to make the epic journey to bring Nemo home. Marlin discovers bravery he never knew, but will he be able to find his son?
Dory, a Paracanthurus, gets separated from her parents as a child. As she grows up, Dory attempts to search for them, but gradually forgets them due to her short-term memory loss. In the flashback of the previous film, ''Finding Nemo'', she joins Marlin – a clownfish looking for his missing son Nemo – after accidentally swimming into him. Marlin decides to help Dory look for her long lost parents with the help of some unlikely friends they meet along the way.