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)

Natalie Strom

Young Kida (voice)

Jim Cummings

Additional Voices (voice)

Patrick Pinney

Additional Voices (voice)

Frank Welker

Leviathan (voice) (uncredited)