The evil organization Shocker alters history by sending their newest creation, Kamen Rider 3, to defeat Kamen Riders 1 and 2 back in 1973. In the alternate present, Shocker is more powerful than ever, and most of the Kamen Riders are now either imprisoned or brainwashed to work for them. One such brainwashed Rider is Shinnosuke Tomari who thanks to his partner Kiriko Shijima, remembers the truth and joins forces with the remaining Kamen Riders who are still at large to make a stand against Shocker and put history back on its proper course.
Ryoma Takeuchi
Rio Uchida
Mitsuhiro Oikawa
Yu Inaba
Tetsuo Kurata
Yuichi Nakamura
Kousei Amano
Nobuhiko Takada
Taira Imata
Rei Yoshii
Tsurutaro Kataoka
Kenta Hamano
Kento Handa
Rakkyo Ide
Takayuki Tsubaki
Ryoji Morimoto
Takahiro Hōjō
Hochu Otsuka
Shunsuke Nishikawa
Gaku Matsumoto
中村嘉惟人
Yuuka Yano
Kasumi Yamaya
Takashi Sasano
Taiko Katono
Chris Peppler
Takehiko Kano
Takeshi Sasaki
Surage Gajria
Seiji Hiratoko
Masahiro Ezaki
Mitsumasa Sano
Daikichi Sano
Tsutomu Tareki
Tetsu Inada
Kunihiro Kawamoto
Hideo Ishikawa
Tomokazu Seki