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
Kamen Rider: THE FIRST
Kamen Rider × Super Sentai: Super Hero Trouble – Who’s the culprit?!
Puella Magi Madoka Magica the Movie Part II: Eternal
The Swan Princess: Escape from Castle Mountain