- Ryutaro Imai (Baku Yorozu / Kamen Rider ZEZTZ)
- Maho Horiguchi (Nem)
- Kenta Mishima (Tetsuya Fujimi)
- Rina Onuki (Nasuka Nagumo)
- Miki Yagi (Minami Yorozu)
- Yuki Furukawa (NOX)
- Jay Kabira (Zero (voice))
- Koichi Yamadera (ZEZTZ Driver (voice))
Kamen Rider — S2E43
Episode: Friend or Foe? The Mysterious Riderman
Air Date: 1973-12-08
Runtime: 25 min
Overview
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�