There was about 1 year between the made for video movie Shin Kamen Rider and this theater release.
Asou, Masaru (Tsuchikado, Hiroshi) was assistant to Dr. Mochizuki (Sasaki, Isao), who against his will experimented on him.
The experiment turned Asou, Masaru into the grasshopper-man cyborg, Kamen Rider ZO. Horrified at what he had become Asou, Masaru fled to woods where he hibernated until a telepathic call for help woke him, Dr. Mochizuki's son Hiroshi was in danger.
In his first film Kamen Rider ZO does not name his punches and kicks, however in his second film he uses "Rider Kick".
Although the name was never mentioned in the film his motorcycle is named Z Bringer.
Kamen Rider Z0 fought monsters created by the Neo Organism.
Kamen Rider ZO was played by stuntman/actor Okamoto, Jiro.
(the movie as now posted on TOEI TOKUSATSU WORLD OFFICIAL youtube channel, turn on CC for English subtitles)
The opening theme for Kamen Rider ZO was "The Whereabouts of a Smile". The ending theme was "Love Can't Be Stopped". Both by INFIX.
Kamen Rider ZO appears twice, in the movies Kamen Rider ZO (1993), which was shown in theaters along with Special Investigator Robo Janperson and Gosei Sentai Dairanger movies, and in Kamen Rider World (1994), an 8 minute film which pitted Kamen Rider ZO and Kamen Rider J against a giant sized Shadowmoon and severl revived human sized kaijin.