 In 2193, criminal Mordecai Sahmbi has invented a time machine called TRAX. He uses the device to help 200 of his friends escape by time-travelling to 1993. TRAX is captured by the police, but not before Sahmbi himself escapes. Capt. Darien Lambert is a cop who travels back to 1993 with the mission of sending all the criminals back home (he cannot himself return until the mission is completed, since TRAX only allows two trips). Lambert is armed with Selma, a self-aware computer, and a small weapon called a PPT which can send criminals to the future (the red button) or render humans unconscious for a few minutes (green) or several hours (blue).