Merc: 2000 is a supplement for Twilight: 2000 2nd Edition. This 120 page sourcebook is an alternate background and world situation where a nuclear holocaust did not destroy civilization. It includes sections on chronology, character generation, equipment, vehicles, the referee, patrons, the world of 2000, the hiring hall, time, travel, and encounters, new combat rules, the opposition, price list, and designers' notes.