The original Nine Heisei Riders are the protagonist Kamen Riders of the first nine shows of the Heisei era Kamen Rider Series. They return at various points and in varying numbers in Kamen Rider Decade where they give Tsukasa Kadoya the mission to save the multiverse by becoming the tenth Heisei Rider, Decade. He starts his journey by travelling across the Nine Worlds, meeting alternate versions of the Nine Heisei Riders in their respective worlds.