Aliens have stolen orbs allowing them to return to your world's distant past.
Having established covert bases, replete with warehouses and power plants,
the aliens are attempting to alter the past and your present.
They will too, unless you recover those orbs. You must also eliminate as many
aliens (and their little vermin buddies) as you can. To accomplish your mission
you must use whatever resources you can find, even alien stuff.
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