Universe at War: Earth Assault, begins in the year 2012 when an alien race known as the Hierarchy lands on Earth to strip-mine the planet. Before their landing, observatories and scientists on Earth gave warning of aliens but the human race, as a whole, is not able to organize a unified military front against the alien forces. Because the Hierarchy has vast military experience from invading and destroying other planets in the universe, the human race is not able to withstand their forces.
Novus (machines who fight the Hierarchy to avenge their fallen creators) arrives just in time to save Washington, DC, where the U.S. military made its last stand. Then they start establishing bases, using guerrilla tactics to harass the Hierarchy. When Novus arrive on Earth, they expect humanity to be extinct and earth’s surface strip-mined, in accordance with Hierarchy standard operating procedure. However, Novus found Earth mostly intact and the human military not yet entirely wiped out. Humanity owes its continued survival to the fact that Kamal Re’x the Abductor, the overseer in charge of the Hierarchy’s Earth invasion, has held back the bulk of his forces to lure Novus into a trap. Kamal Re’x hopes to earn a promotion by wiping out the Novus expeditionary force. Mirabel, a clone of the Novus’ creators/field commander, tried to board a command ship, but the ship is scuttled once they learn she is on it. She manages to escape, however, and tells the Founder (the Novus leader) about Kamal’s trap. In the end, Novus proves unable to stop the Hierarchy, suffering a major defeat when the command base on Earth is destroyed, along with the portal they intended to use to return to their planet. The Founder also dies, because the portal was at the verge of detonating and destroying both Earth and the Novus’s base planet, so he sacrificed himself to save both worlds. Kamal feels that he has beaten Novus and orders the Hierarchy super weapon, The Purifier, which can destroy large areas of the planet in one blast, to be prepared to destroy the Earth.
However, while the Hierarchy commander Orlok was diverting Novus so The Purifier can be deployed, he unwittingly tripped an ancient alarm in the Egyptian pyramids, and the Masari, asleep beneath the Earth’s oceans, begin to waken. Though the Masari mothership initially creates a signal that prevents the Purifier from being used, the Hierarchy bomb the ship, board it, and prepare to use the Purifier.