Why was Dory alone in the ocean when she met Marlin? Where did she come from and why did she speak whale so well? The forgetful palette surgeonfish can't remember anything and has even forgotten her parents. Until an accident brings back a childhood memory. Now, Dory only wants one thing: to find her parents. Together with Marlin and Nemo, she sets off on a journey to a marine biology institute on the coast of California. There, she is caught out of the water and separated from her friends. Alone, she ends up in an aquarium at the institute. But she finds a new friend, the octopus Hank, and meets an old friend, the whale shark Destiny, while Marlin and Nemo follow their friend in unusual ways.