The Nightmare King

The primary antagonist of the story. He had been sealed behind a massive door in the distant past, until Nemo, swayed by Flip's erroneous guidance, inadvertently sets him free. He abducts King Morpheus to draw Nemo—and, crucially, the Royal Scepter, an object feared by him and the other residents of Nightmare Land—to his Nightmare Castle. Nemo narrowly succeeds in destroying the Nightmare King using the scepter, thereby ending the tyrant's rule as well as Nemo's own nightmares.