Genius: King Morpheus' advisor. He comes to the real world to bring Nemo to Slumberland. As a sophisticated man, he is quite punctual and prefers order as opposed to madness. He is quite a dancer, as he dances quite a bit during Nemo's coronation ceremony. In the real world, he is an organ player in a circus that stops in Nemo's town. Danny Mann as Icarus: a flying squirrel, Nemo's best friend and a supporting protagonist. Icarus is Nemo's only friend from the real world. He shows great concern for Nemo's wellbeing in a sense similar to that of two siblings. He speaks a mix of both squirrel and some English. His screech is painful to the ears of the Boomps. He detests being called a "little rat" (which Princess Camille mistakes him for). Unlike other squirrels, Icarus eats human food, like cookies. His initial relationship with Princess Camille, though rough, eventually changes for the better. Bernard Erhard (Kenji Utsumi in the Japanese adaptation) as King Morpheus: The sovereign of Slumberland. He has protected Slumberland for years with the help of the royal scepter: an ancient weapon of great power. Though he is a child at heart, he knows when to be serious. He has Nemo brought to Slumberland so that he may become his heir to the throne. He gives Nemo the key to Slumberland, which can open any door; however, he warns Nemo of one door with a dragon symbol emblazoned on it that must never be opened. Like Professor Genius, he is quite a dancer, as he dances alongside the Professor during Nemo's coronation ceremony. When Nemo accidentally releases the Nightmare King, King Morpheus is captured and Nemo has to go and rescue him from Nightmare Land. In the real world, he is the ringmaster of a circus that stops in Nemo's town. Bill Martin (Tarō Ishida in the Japanese adaptation) as The Nightmare King: He is a demonic horned creature who rules over the realm of Nightmares or Bad Dreams. When Nemo goes to Nightmare Land to save King Morpheus, the Nightmare King has his minions capture Nemo's friends (Professor Genius, Flip, and Princess Camille). He is shown to be a liar and quite temperamental as he destroys several minions for the failure of just one of his underlings (the general of his army). Among his forces are a gigantic flying stingray and a presence known