After battling Dr. Vegai, two weeks pass, as Den and his battalion prepare to leave Erzat, for Earth, with their newly acquired weapons and information. Having formed a shaky alliance with the Rasians, it seemed as everything will work out for the best, for both groups; however, something unexpected happens. Another enemy emerges, descending onto the alien planet from space, in a large swarm. They are monstrous drones, who attack everything without discrimination, wreaking even greater havoc than the terror beast. As if things couldn't get anymore direr, larger and more evolved terror beasts appear out of nowhere, drawn out by the utter chaos. Den and his allies must now find a way to survive this new threat, while battling themselves, and against time, as a bomb is dropped onto the planet, set to go off within a few hours. And the worst part in all of this is, their real enemy is someone they know and trust, hiding amongst their ranks