A character named Plato appeared very early in production of Atlantis: The Lost Empire. It was to be Milo Thatch's pet rat that accompanied him on the journey to find Atlantis and clearly named after the Greek philosopher Plato.
The character was abandoned as it was a cute animal sidekick, something the filmmakers did not want to have in an effort to set the film apart from other Disney animated features. In place of Plato, the final film sees Milo with a pet cat named Fluffy, who is left in the care of Preston Whitmore when he partakes in the expedition to Atlantis. Furthermore, the character of Gaetan Moliére allowed for an alternative to the cute animal sidekick type to be developed.