Zetman(ゼットマンZettoman) is a manga series by Masakazu Katsura. The series started as a one-shot in a series of four published in the Shueisha Weekly Shōnen Jump magazine between 1989 and 1994, and collected into a tankōbon released in 1995. A more mature and full-fledged series started in the seinen Young Jump magazine in 2002. The initial volumes were positively reviewed while the later ones have been criticized for losing some of its initial originality.