Jack Palance

Omus

Carol Lynley

Nikki

Barry Morse

Dr. John Caball

John Ireland

Senator Smedley

Nicholas Campbell

Jason Caball

Anne-Marie Martin

Kim Smedley

Greg Swanson

Sparks (voice)

Mark Parr

Sparks

William Hutt

Lomax (voice)

Ardon Bess

Merrick

Lynda Mason Green

Lunar technician

Albert Humphries

Robot technician

Bill Lake

Spacesuited man

George McCowan