Tsukasa travels to his home world of the World of Decade, where he discovers the origin of his powers and his true heritage as the leader of Dai-Shocker. The film features all ten of the lead Heisei Kamen Riders, as well as all of the Shōwa period Kamen Riders, leading to a total of 25 Riders.
井上正大
as Tsukasa Kadoya / Kamen Rider Decade
村井良大
as Yusuke Onodera / Kamen Rider Kuuga
森カンナ
as Natsumi Hikari
戸谷公人
as Daiki Kaito / Kamen Rider Diend
石橋蓮司
as Eijiro Hikari / Doctor Shinigami
奥田達士
as Narutaki
荒井萌
as Sayo Kadoya
大浦龍宇一
as Nobuhiko Tsukikage / Shadow Moon
Gackt Camui
as Jôji Yûki
倉田てつを
as Kotaro Minami / Kamen Rider Black / Kamen Rider Black RX
賀集利樹
as Shouichi Tsugami / Kamen Rider Agito
市川理矩
as Young Tsukasa Kadoya
