Written and co-directed by Andrew Stanton, Finding Dory does seem to play heavily off Finding Nemo, which is little surprise since Stanton also wrote and directed that.
Finding Dory picks up with the titular regal tang who suffers from memory loss, six months after the events of Nemo.
Finding Nemo focused on Marlin’s journey to look for his son when he was taken by scuba divers.
Dory decides she wants to track down her parents, and Nemo and his dad, Marlin, join him on the journey.