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Earth's a devastated wasteland, and what's left of humanity has colonised the Moon in domed cities. Humanity's survival depends on an anti-radiation drug only available on planet Delta 3, 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 3; to stop Omus.
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