Masami Hata Director Masanori Hata Director William T. Hurtz Director Rene Auberjonois Professor Genius, The Nightmare King Voice Bever-Leigh Banfield Woman Voice Michael Bell Oompy Voice Nancy Cartwright Page Voice Gabriel Damon Little Nemo Voice Jennifer Darling Nemo's Mother Voice Bernard Erhard King Morphy Morpheus Voice June Foray Librarian Voice Kathleen Freeman Dance Teacher Voice Ellen Gerstell Page Voice Michael Gough 2nd Teacher Actor Sherry Lynn Bon Bon Voice Tress MacNeille Elevator Creature Voice Danny Mann Icarus, the squirrel Voice Michael McConnohie Etiquette Master Voice Laura Mooney Princess Camille Voice Alan Oppenheimer Oomp Voice Mickey Rooney Flip Voice Neil Ross Oompa Voice John Stephenson Oompo Voice Beau Weaver 1st Teacher Voice Ray Bradbury Writer Chris Columbus Writer Yutaka Fujioka Writer, Producer Winsor McCay Writer Richard Outten Writer Edward Summer Writer Thomas Chase Original Music Steve Rucker Original Music Richard M. Sherman Original Music Robert B. Sherman Original Music