Doomsday Warrior is a series of science fiction short novels set in 2089 and later, depicting the struggle to reclaim America from the USSR, after a nuclear strike and invasion in 1989 (the first book was written in 1984). The author, Ryder Stacy, is a pseudonym shared by Jan Stacy and Ryder Syvertsen. The series was published as part of the Zebra Books Men's Adventure series.