Ambitious Destron scientist Yuki Joji is condemned to death by Marshal Armor, who sees him as a threat to his position in the organization. Slowly Yuki is lowered into a pool of sulfuric acid, losing his right arm before being rescued by his fellow scientists, who make a daring escape. Hidden away, Katagiri contacts his sister, who is a nurse, to assist in Yuki's cybernetic operation. But Destron is watching and sends Sickleneck-Tortoise to kill them�
| Title | Friend or Foe? The Mysterious Riderman |
|---|---|
| Genres | Action & Adventure Sci-Fi & Fantasy Drama |
| Release Date | 1973-12-08 |
| Episode Runtime | 00 Hours 24 Minutes |
| Season Number | 2 |
| Episode Number | 43 |
| Production Companies | TV Asahi, Toei Company, ADK, Ishimori Production |
