Unknown forces have set in motion a chain of events that could eliminate every living being in the Vagner System. The Rangers, an elite law enforcement organization, pose the only real threat to this sinister plot. To thwart their investigations, the conspirators orchestrate a campaign to undermine the Rangers with infiltration, sabotage, and false incrimination. Ranger Mace Griffin is framed in such a set-up and sentenced to ten years on Penal Colony Delta. In prison, Mace becomes introverted and embittered, and swears to take revenge on those who have wronged him.