Synopsis

The story revolves around the nine previous universes of the Heisei Kamen Riders merging into one, something that would destroy all the worlds. To prevent this, Tsukasa Kadoya transforms into Kamen Rider Decade to protect his own dimension by defeating the Kamen Riders of the other dimensions.

Rider War

The Rider Army (ライダー軍, Raidā Gun) first revealed in Natsumi Hikari's dream, composed of many Kamen Riders, all of whom where seemingly defeated by Kamen Rider Decade. However, Kamen Rider Kuuga survived the initial battle, assuming Ultimate Form to confront Decade once again with the two seemingly destroying each other in the ensuing battle. As Narutaki explains t o Natsumi, it will be the Rider War that awakens Decade as the demon destined to destroy all the worlds.

Casting

Masahiro Inoue, who has portrayed Keigo Atobe in the Prince of Tennis musicals, has been cast in the lead role for Decade as Tsukasa Kadoya/Kamen Rider Decade. Also involved is Kanna Mori as Natsumi Hikari, Renji Ishibashi as Natsumi's grandfather Eijiro Hikari and Kimito Totani as Daiki Kaito/Kamen Rider Diend . Another member of the cast is Tatsuhito Okuda as the mysterious Narutaki. Kamen Rider Kuuga's World, as well as most of the other Rider Worlds, sport several characters that have been renamed and cast with different actors. Ryouta Murai has been cast as Yuusuke Onodera who is the series' version of Kuuga.

Hero on 10 Years

Kamen Rider Decade
(仮面ライダーディケイド, Kamen Raidā Dikeido, Masked Rider DCD, Masked Rider Decade) is the title of the 2009 edition of the long-running Kamen Rider Series of tokusatsu dramas. Advertisements in Japanese magazines feature the title character amongst the title characters of the previous nine Heisei Kamen Rider Series, with the secondary riders of each series appearing in recent trailers. Decade, as its title suggests, is the tenth of the Heisei Rider Series, having begun with Kamen Rider Kuuga in 2000. It began broadcast the week following the finale of Kamen Rider Kiva and will be featured in Super Hero Time alongside the 2009 edition of the Super Sentai Series, Samurai Sentai Shinkenger. The catchphrase for the series is "Destroy everything, connect everything." (全てを破壊し、全てを繋げ, Subete o hakaishi, subete o tsunage).