The game takes place in the year 2161, after Earth has colonized Primus IV to exploit the rich deposits of a new element, called SL18. After some skirmishing with scattered indigenous life forms, the colonists take hold of Primus IV and begin mining SL18. Fast-forward 40 years--the colonists have been consistently used and abused by Earth, as SL18 turns out to be a valuable military-grade material. Using their newfound wealth from controlling the only known supply of SL18 in space, the colonists of Primus IV declare their independence from Earth, hiring an elite mercenary force, the WarMonkeys, for the assault they know will come from Earth. As expected, Earth retaliates by sending a contingent of its veteran Imperial Order division to quell the rebellion. And, after 40 years of breeding, the indigenous Mantai emerge from their subterranean lairs to erase humanity from the face of their home world.