From the black depths of interstellar space, comes an alien invasion fleet that has journeyed for a thousand years towards its target, modern day Earth. The approaching fleet triggers an ancient deep space detection system, which awakens a crew deep inside the Moon from their long sleep to face the invasion. If Earth is to be saved, ancient defenses need to be hastily repaired and prepared for battle. Under manned, unsupported and running out of time, the ancient astronauts are forced to forge alliances with the people of Earth, if the planet is to be saved from destruction. United, humanity rises to the occasion and has its finest hour as they fight what could be their last battle. Led by the hastily retro fitted space shuttle Enterprise, Earth launches four space shuttles armed with alien technology against the invasion fleet in a desperate battle to save mankind.