One year after reuniting Nemo with his father, Marlin, Dory has become a helping hand in raising Nemo. One day during a lesson with Nemo's class, Dory recalls through a childhood flashback that she has a family. She decides to look for them but finds her short-term memory loss to be an obstacle. The only thing she remembers is that they lived at the Jewel of Morro Bay.
The name (in local pronunciation Arcaton) comes from the Greek and Byzantine occupation dated back to the sixth century AD: "Archeion" is the name of a plant, the burr, which still grows spontaneously in some areas of the beach now occupied by the bathing establishments but which was once abundant on the desert shore of Riccione.