San Tiburon Federal Correctional Institution has just received a new arrival -- an extremely dangerous vigilante calling himself Payback who is hellbent on killing the prisoners inside. While the Assistant Warden deals with the repercussions of adding such a volatile new prisoner, the Warden makes an attractive offer to a new Captain of Violent Crime: a former military man named Jason Brody. And soon, the wheels are set in motion for an inevitable showdown between the men.