Out beyond the starfield Orion lies a vast stargate that leads to planet Earth. To mark its position in the darkness of space, the Elders of Earth set an avenue of pyramids at its entrance so that the ships of Earthfleet could find their way home.

Now, in the second century of the Great Galactic War, an Andromedan starfleet is attempting to use the stargate as a route for the invasion of Earth itself. Your mission is to guard the stargate and prevent the Andromedan fleet from passing through.
Above all, you must destroy their Dragon class starcruisers which carry their battle commanders - if you fail to do this, all may be lost!