Masaru Aso was the lab assistant of geneticist Doctor Mochizuki, used as one of his experiments related the creation of the Neo Organism, enabling him to transform into a grasshopper-like being called Kamen Rider ZO. He fled into the mountainside and went into a coma before he was awakened by a telepathic call two years later with an unconscious urge to protect Hiroshi Mochizuki, the son of Doctor Mochizuki.
Hiroshi Tsuchikado | Masaru Asou / Kamen Rider ZO |
Shohei Shibata | Hiroshi Mochizuki |
Isao Sasaki | Dr. Mochizuki |
Hiroshi Inuzuka | Seikichi Mochizuki |
Naomi Morinaga | Reiko |
Kenji Ohba | Kuroda |
Masaru Yamashita | Nishimura |
Iori Sakakibara | Miyazaki |
Shingo Yuzawa | Neo Organism / Doras (voice) |