The story begins with Nobita and Shizuka sitting on the pipes in the yard they hang out at while Suneo showed off his robot. Nobita grew jealous and asked Doraemon to build him a giant robot.

A mysterious pink fog takes Nobita, Doraemon, Shizuka, Suneo, and Gian to a planet populated by animals. Legend says that the ancestors of this population used to live on the moon, but were ...