Set in the near future you return as Captain Garth Conrad. Planet X is on a collision course with Earth as its orbit decays. You must avert this disaster.
Luckily your sidekick Professor Rogers is building a Dome Defence Computer that will blast Planet X into another dimension.
Unluckily Planet X is inhabited by hostile aliens whose goal is Earth's destruction! Wave after wave of suicide ships hit and damage your secret base in the North Pole, and then comes the mothership......
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