Robert Clarke
— Rob
Robert Bice
— Bram, Rob's pal
Stuart Randall
— Gordon, chief of the Upriver People
Margaret Field
— Ruth
Ron Randell
— Riddon, chief of the Mutates
Gloria Saunders
— Catherine, the Norm traitoress
William Schallert
— Carver, the Mutate traitor
Douglas Evans
— Jason, the Norm traitor
Marshall Bradford
— Mutate Council Leader
Tom Daly
— Dirk, a Mutate
Eric Colmar
— Sabron, a Mutate
Chili Williams
— A Norm Woman
Paula Dorety
— A Norm Woman