Shockman takes about two years after the original Kaizou Choujin Shubibinman. Arnold (Tasuke in the Japanese version) is no longer a student and works as a cook in a local restaurant. Sonya (Kyapiko in Japanese version) remains a student. Since the fall of the Dark Skull, Doc has constantly suspected that another invasion was coming sending Arnold and Sonya on searches for the new invaders although never finding anything. However, one day, after Doc is kidnapped, Arnold and Sonya find out that an alien empire led by Ryo is planning to take over the world. Also, two other villains have appeared with similar powers to Arnold and Sonya. They are dark Shubibinman named Jeeta and Mue. Arnold and Sonya must now rescue Doc, stop Ryo from taking over the world, and avoid being killed by Jeeta and Mue.