When a lab experiment goes disastrously wrong, the fate of the free world will depend on a band of broken soldiers just trying to keep what's left of their sanity in a landscape of destruction.

Captain Corban Rhodes should have died on the battlefield when a spaceship crashed on top of him. When he wakes up in the hospital fitted with robotic cybernetic implants, the consequences will leave him and those like him struggling just to survive against cataclysmic forces.

Now the fate of the galaxy rests on Battalion 1 averting a devastating alien invasion that will tap these wounded soldiers' worst fears and decide once and for all if they're still human.