In the fight for humanity, one final hope remains...

Humans are losing the war. Master Sergeant Reed Beckham and the survivors of 1st Platoon must battle through the tunnels--where they make a grisly discovery.

Dr. Kate Lovato is working on a new bioweapon to destroy the Variants when a derelict Navy Destroyer crashes into the Connecticut shoreline carrying yet another threat.

As the doomsday clock ticks down and military bases fall across the country, the human race enters the age of extinction. Will they prevail - or will mankind vanish off the face of the planet?