Kamen Rider ZO

Masaru Aso was once an assistant at Dr. Mochizuki's genetics laboratory, where he was forcibly used as the first human subject in experiments combining human biology with grasshopper genes. After escaping and sleeping for four years in a mountain cave, Masaru awakens with the ability to transform into Kamen Rider ZO. Drawn back into Dr. Mochizuki's unfinished research, he becomes the protector of the doctor's son Hiroshi while confronting Doras, the autonomous Neo Lifeform created from the same research that transformed him.