In the year 3499, programmed UNION Soldier 034 infiltrates the Separatist City of Subterra in search of the Psion Machine, humanity's most sought-after and cryptic super technology. The mission falls apart when he finds that he and the infamous machine share a puzzling bond.
Following unexpected treacheries in Subterra and in Stone Corp., both groups prepare for war. In light of this, 034 must decide if he will utilize his capabilities to aid in the emergency evacuation of the citizens or stand with his friends in battle and embrace the killer within so that more might live.