Michael J. Fox Milo James Thatch (voice) Cree Summer Princess 'Kida' Kidagakash (voice) James Garner Commander Lyle Tiberius Rourke (voice) Claudia Christian Helga Katrina Sinclair (voice) Phil Morris Dr. Joshua Strongbear Sweet (voice) Leonard Nimoy King Kashekim Nedakh (voice) John Mahoney Preston B. Whitmore (voice) Corey Burton Gaetan 'The Mole' Moliere (voice) Don Novello Vincenzo 'Vinny' Santorini (voice) Jacqueline Obradors Audrey Rocio Ramirez (voice) Florence Stanley Wilhelmina Bertha Packard (voice) David Ogden Stiers Fenton Q. Harcourt (voice) Jim Varney Jebidiah Allardyce 'Cookie' Farnsworth (voice) Jim Cummings Additional Voices (voice) Patrick Pinney Additional Voices (voice)