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.
as Tsukasa Kadoya / Kamen Rider Decade
as Yusuke Onodera / Kamen Rider Kuuga
as Natsumi Hikari
as Daiki Kaito / Kamen Rider Diend
as Eijiro Hikari / Doctor Shinigami
as Narutaki
as Sayo Kadoya
as Nobuhiko Tsukikage / Shadow Moon
as Jôji Yûki
as Kotaro Minami / Kamen Rider Black / Kamen Rider Black RX
as Shouichi Tsugami / Kamen Rider Agito
as Young Tsukasa Kadoya
as Young Sayo Kadoya
as Ambassador Hell
as General Jark (voice)
as Kamen Rider 1 (voice)
as Kamen Rider 2 (voice)
as Kamen Rider V3 (voice)
as Kamen Rider X (voice), Garagaranda (voice)
as Kamen Rider Amazon (voice), Ikadevil (voice)
as Kamen Rider Super-1 (voice), Kamen Rider J (voice)
as Momotaros / Kamen Rider Den-O (voice)
as Kamen Rider Ouja (voice)
as Kamen Rider KickHopper (voice)
as Shotaro Hidari / Kamen Rider Double (voice)
as Philip / Kamen Rider Double (voice)
as Kiva-la (voice)
as Kamen Rider ZX (voice)
as Kamen Rider Ixa (voice), Shocker Combatmen (voice)
as Skyrider (voice), Kamen Riders, Dai-Shocker members (voice)
as Kamen Rider Blade (voice), Riders, Dai-Shocker members (voice)
as Tournament Announcer, Decadriver, Diendriver, K-Touch (voice)
as Gaia Memory (voice)
as Other Kamen Riders (voice), Other Dai-Shocker members (voice)
as Other Kamen Riders (voice), Other Dai-Shocker members (voice)
as Other Kamen Riders (voice), Other Dai-Shocker members (voice)
