'Legs' Larry Smith
— Narrator
Stéphane Cornicard
— Dan Morgan
Will Harrison-Wallace
— Doctor Notanazi
Peter Dickson
— Albert
Ruth Urquhart
— Lorna
Anthony Rudd
— Territorial Agent
Katy Maw
— Snake
Jim Davis
— Dr. Quent Brady (archive footage)
Robert Griffin
— Dan Morgan (archive footage)
Joel Fluellen
— Arobi (archive footage)
Barbara Turner
— Lorna (archive footage)
Eduardo Ciannelli
— Mahri (archive footage)
Vladimir Sokoloff
— Dr. Lorentz
Tim Huntley
— Territorial Agent (archive footage)