The film is both a sequel and spin-off following the events of Finding Nemo (2003). Ellen DeGeneres and Albert Brooks reprise their roles from the first film, with Ed O'Neill, Kaitlin Olson, Hayden Rolence, Ty Burrell, Diane Keaton and Eugene Levy joining the cast. The film focuses on the amnesiac fish Dory (DeGeneres), who journeys to be reunited with her parents.