James Arnold Taylor as Milo (voice)

Cree Summer as Kida (voice)

John Mahoney as Whitmore (voice)

Jacqueline Obradors as Audrey / Nurse (voice)

Don Novello as Vinny (voice)

Corey Burton as Mole (voice)

Phil Morris as Sweet (voice)

Florence Stanley as Packard (voice)

Frank Welker as Obby / Mantell (voice)

Steven Barr as Cookie (voice)

Clancy Brown as Volgud (voice)

Jean Gilpin as Inger (voice)

Kai Rune Larsen as Seaman / Gunnar (voice)

Bill Fagerbakke as Sven (voice)

Thomas F. Wilson as Carnaby (voice)

Jeff Bennett as Sam McKeane (voice)

William Morgan Sheppard as Erik Hellstrom (voice)