Walter Koenig

Col. Jason Grant

Bruce Campbell

Ray Tanner

Robert Kurcz

Koreman

Leigh Lombardi

Mera

Tom Case

Beck

Judy Levitt

Intrepid Commander

Reavis Graham

Haskell

Reuben Yabuku

Intrepid Pilot

Doug Childs

Grant's Son

Mariafae Mytnyk

Research Assistant

John J. Saunders

Barnes

James A. Courtney

Lieutenant

B.K. Taylor

Additional Voices (voice)