In the mid-21st century, a barbaric alien race called the Strogg launched a massive invasion on Earth. Originally believed to be an attempt to strip the planet of its natural resources, humans soon discover that the Strogg are simply after only the human remains of those they kill. Through a horrific process, the limbs and flesh of the fallen are fused with metal and machinery to create the monstrosities that are the alien Strogg.

The Strogg and humans battle for years on Earth, but as resources become depleted, Earth mounts a counter-assault on the Strogg homeworld. The first assault force is launched from the fleet and encounters overwhelming resistance--most of the drop-ships are destroyed by the Strogg homeworld's massive defense weapon known as The Big Gun. However, one surviving Marine breaks through and is able to destroy the big gun and ultimately defeat the Strogg leader, the Makron. But the war did not end there.

You are Matthew Kane, a member of the elite Rhino Squad and part of the next massive invasion that spans across the entire Stroggos planet. Equipped with hi-tech weapons, vehicles and teamed with Earth's top marine squadron you soon realize that this war is far from over. In fact, your worst nightmare is soon realized when you discover that the only way to defeat the Strogg is to become one of them.

The Strogg are cybernetic warriors--a mechanical frame and decaying body parts stabilized by flesh consumed in a systematic annihilation of other species and civilizations. In a desperate attempt to survive a Strogg attack on Earth, an armada of Earth's finest warriors is sent to take the battle to the Strogg home planet. Earth's initial assault force is nearly annihilated immediately, but one marine manages to infiltrate the base, bring down their planetary defense systems, and kill the Strogg's collective brain and leader--the Makron. Earth assumed the destruction of the Makron would end it all, but it didn't. The Strogg are quickly regrouping. However, with the Strogg's planetary defenses still destroyed, Earth's forces can deliver a full and final assault. This time, you're not alone. You are Matthew Kane, an elite member of Rhino Squad, and part of Earth's next invasion wave. An army of soldiers are fighting with you and an arsenal of weapons and vehicles are at your disposal in this heroic and epic battle between worlds.

As the invasion begins, players choose to battle as one of five unique classes in either the EDF (Earth Defense Force - humans) or the barbaric alien Strogg armies, each augmented with specialist weapons and combat hardware. Troops utilize over 40 conventional and futuristic vehicles, deployable structures, and defense systems like quad-bikes, tanks, and alien walkers for epic ground assaults; or helicopters and anti-gravity ships to lend firepower from the air. Throughout each battle, teams establish bases, deploy defense structures, artillery, radar, and advanced forward-command systems into enemy territory while constructing and demolishing obstacles to speed progress and gain a tactical advantage over the enemy.