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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.
as Masaru Asou / Kamen Rider ZO
as Doctor Mochizuki
as Hiroshi Mochizuki
as Seikichi Mochizuki
as Reiko
as Kuroda
as Nishimura
as Miyazaki
as Neo Organism / Doras (voice)
1984
1998
2020
2011
2024
2006
2024
2006
2024
2024
2019
1981
2024
2023
