John Saxon as Capt. Anthony Vico

Kathleen Miller as Dr. Allison Crowley

Keene Curtis as Dr. William Scott

James Olson as Surgeon

Martine Beswick as Tana

Reb Brown as Sprang

Ford Rainey as Sirus

Bill McKinney as Badger

Gerrit Graham as Daniel

Catherine Bach as Lara, the Guide

Cynthia Wood as Arana

Norland Benson as Hide

Richard Farnsworth as Elder

Lawrence Greenstein as Mutant (uncredited)