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.

Directed by: Osamu Kaneda
Written by: Shouji Yonemura
Release date: 2009-08-08
Runtime: 66 minutes
Tagline: Traveling across Time and Space, Gathering here. The Ultimate Hero Movie is Born!!
Cast:
Masahiro Inoue Masahiro Inoue
Tsukasa Kadoya / Kamen Rider Decade 
Ryouta Murai Ryouta Murai
Yusuke Onodera / Kamen Rider Kuuga 
Kanna Mori Kanna Mori
Natsumi Hikari 
Kimito Totani Kimito Totani
Daiki Kaito / Kamen Rider Diend 
Renji Ishibashi Renji Ishibashi
Eijiro Hikari / Doctor Shinigami 
Tatsuhito Okuda Tatsuhito Okuda
Narutaki 
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Also known as:
  • Kamen Rider Decade: All Riders vs. Dai-Shocker
  • 극장판 가면라이더 디케이드 올라이더 대 대쇼커