[1] The Novus (a race of machines fighting the Hierarchy to avenge fallen creators of them) arrive just in time to save Washington, D.C. which has U.S. military creating a last stand.

Over the course of these missions the Novus field commander Mirabel, a cloned member of Novus' creator species, manages to befriend the human General Moore, in charge of leading what's left of the US forces after the initial Hierarchy invasion, and together they are able to launch an attack on a Hierarchy Material Conduit and use it to enable Mirabel to board one of their command ships, learning that Kamal Re'x, the overseer in charge of the Hierarchy forces on Earth has purposefully delayed the Purifier's activation in order to use it to destroy the Novus forces when they arrive on Earth before scuttling the command ship to kill Mirabel.

With the Novus portal destroyed and forces they had scattered Kamal gives the order for the Purifier to be primed for activation, however, while distracting the Novus from the Purifier, Hierarchy field commander Orlok accidentally trips an ancient alarm in the Egyptian pyramids, and the Masari, asleep beneath the Earth's oceans, begin to waken.

The prince and his forces join Orlok as he tries to capture a communication center to contact the others who want to separate from the Hierarchy.

Humanity with the help of Masari and Novus rebuilding civilization and fulfilling destiny to oppose and defeat the Hierarchy.

The players are each given a base and a construction unit and must build up their forces to achieve domination of the chosen game map.

The Universe at War: Earth Assault Original Soundtrack was composed by Frank Klepacki and released on December 22, 2007.

It offers three interesting and diverse sides, great graphics, and some tantalizing strategic elements but it's afflicted by some unfortunate quirks that hold the game back.

"[10] IGN remarked of the same console version, "What Petroglyph has done is to take the basic framework and use it to create a game with three wildly unique but finely balanced factions that each offer a level of real-time customization that gives players a chance to really adapt to the changing circumstances on the battlefield.

Unfortunately, the game's campaign doesn't do justice to the overall design while a number of sticky interface and performance problems add to the frustrations.