Little Nemo receives a royal invitation to visit the castle in Slumberland. Is he dreaming? It seems the princess is looking for a new playmate.

When he arrives he is told that King Morpheus has been kidnapped. Nemo sets off on a wild adventure to rescue the good King and restore peace to the land.

Anything can happen in this realm of imagination. Little Nemo even learns how to get a ride from the local creatures so he can pass through the roughest parts of Slumberland.