You find yourself in the middle of the persistent military conflict between two cosmic empires – both of them come from the Earth, both of them conduct R&D on time manipulation, and both are equally powerful in synthesizing necessary materials from any other ones by means of energy – the main source of the future civilizations. 

This struggle has been ongoing for several centuries… but the enemy goes for a desperate and dangerous move – changing the course of history… They send their crew and a massive replicator (which can produce a diverse weapons, equipment, and machines out of nothing) to the past of the Earth, the cradle of civilization, to wipe out our ancestors and win the war in this dirty way.