A young girl discovers a secret map to the dreamworld of Slumberland, and with the help of an eccentric outlaw, she traverses dreams and flees nightmares, with the hope that she will be able to see her late father again.

Each night, young Nemo goes to Slumberland and has adventures and befriends the king of Slumberland, Morpheus. But one night Nemo discovers Nightmare Land, and the evil nightmare king, throwing Slumberland and Nemo himself into da...