Riderman

Riderman is a 10 episode mini-series that aired online to promote the movie Kamen Rider Decade The Movie: All Riders vs. Dai-Shocker. It revolves around the story of the alternate version of riderman in Kadoya Tsukasa's world.

Premise
Jōji Yūki, a quilt-stricken Shoker scientist finally rebells against the organization, but is captured and has his arm cut off as punishment. He is then cast out and left for dead. He is rescued by a rebel doctor who gives him a prosthetic arm that can transform into a laser-canon, and gives him the power to transform into Riderman. He now seeks revenge on Shocker for everything it's done to him, Japan, and the world.