As Dr. Nastadious's base blew up, a mercenary escaped with the professor's work, enzymes, and personal belongings. The mercenary was once the prof's assistant. Now he was from Dr. N's second in command ... ... to nothing. The very original Rex 209 was in his hands, as well as a blueprint to improve it. He had brought along an proto suit, empty Xeno industries style test box, a mine, orange enzyme spawner, orange bullet proton cannon, and the very first orange enzyme. He quickly constructed a 'case' for all of these, and also for Blue (whom he didn't know was dead) in the test box.
There are 25 levels.