Kamen Rider The Terrifying Antlion Pit (恐怖のあり地獄, Kyōfu no Arijigoku) (1971)

The series takes place in a world plagued by Shocker, a mysterious worldwide terrorist organization formed by remaining members of the Nazis. To further its plans for world domination, Shocker recruited its agents through kidnapping, turning their victims into mutant cyborgs and, ultimately, brainwashing them. However, one victim named Takeshi Hongo escaped just before the final brainwashing. With his sanity and moral conscience intact, Takeshi wages a one-man war against Shocker's minions as the grasshopper-themed cyborg (改造人間, kaizō ningen) superhero Kamen Rider