6 SP (1 secret) and 2 Dukematch levels. Features a new weapon (Assault Rifle replacing chaingun) and edited CON code to alter enemy strengths, ammo amount and weapon power. The levels end up leading you from an EDF facility to a secret installation and a prison until you reach a starport. From there you enter a spaceship where the showdown with an Overlord takes place. In the secret level, you travel to an arctic region via submarine.