Richard Thomas as Shad

Robert Vaughn as Gelt

John Saxon as Sador

George Peppard as Cowboy

Darlanne Fluegel as Nanelia

Sybil Danning as St. Exmin

Sam Jaffe as Dr. Hephaestus

Jeff Corey as Zed

Morgan Woodward as Cayman

Marta Kristen as Lux

Julia Duffy as Mol

Earl Boen as Nestor 1

John Gowans as Nestor 2

Lynn Carlin as Nell

Lara Cody as Kelvin

Lawrence Steven Meyers as Kelvin

Eric Morris as Fen

Kathy Griffin as Alien Extra (uncredited)