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)

Corey Burton
Gaetan 'The Mole' Moliere (voice)

Phil Morris
Dr. Joshua Strongbear Sweet (voice)

Jacqueline Obradors
Audrey Rocio Ramirez (voice)

Don Novello
Vincenzo 'Vinny' Santorini (voice)

Jim Varney
Jebidiah Allardyce 'Cookie' Farnsworth (voice)

Florence Stanley
Wilhelmina Bertha Packard (voice)

John Mahoney
Preston B. Whitmore (voice)

Leonard Nimoy
King Kashekim Nedakh (voice)

David Ogden Stiers
Mr. Harcourt (voice)

Jim Cummings
Additional Voices (voice)

Patrick Pinney
Additional Voices (voice)