Planet Earth is a devastated wasteland, and what's left of humanity has colonized the Moon in domed cities. Humanity's continued survival depends on an anti-radiation drug only available on planet Delta Three, which has been taken over by Omus, a brilliant but mad mechanic who places no value on human life. Omus wants to come to the Moon to rule and intends to attack it by ramming robot-controlled spaceships into the domes. Dr. John Caball, his son Jason, Jason's friend, Kim, and a robot named Sparks embark on Caball's space battlecruiser on an unauthorized mission to Delta Three to stop Omus.
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
