Tang Zhi-Wei is kidnapped by Satan Organization, a syndicate with the plan to conquer Earth, and is saved by Dr. Guo Dong before he could be brainwashed. However, Tang's body had already been transformed so he could turn into a superman at anytime, and Guo Dong informs him that he and another young man, Hong Zi-Qiang, are now the Super Riders. Tang and Hong meet each other and begin to battle with Satan Organization's minions and elite members, Magic Queen, Dr. Death, and Hell Ambassador, who seek the GX Formula to dominate and control the world.

A new team of Infra Supermen are created to stop the Brotherhood of Satan from controlling the world. Released as an unofficial sequel to Inframan.