Kamen Rider Decade

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 first-half of the 2009 edition of the long-running Kamen Rider Series of tokusatsu dramas. 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 is 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).

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, and Renji Ishibashi as Natsumi's grandfather Eijiro Hikari. Another member of the cast is Tatsuhito Okuda as the mysterious Narutaki. The World of Kamen Rider Kuuga, 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 Yusuke Onodera who is the series' version of Kuuga.

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 and is told that to protect his own world he must travel with Natsumi and her grandfather to the other Kamen Riders' Worlds (referred to as an A.R. World or Another Rider's World) and eliminate the anomaly in that world. Along the way, confronting the mysterious Narutaki and the thief Daiki Kaitoh, they are joined by Yusuke Onodera of the World of Kuuga and Kivala of the World of Kiva.

Rider War
The Rider Army (ライダー軍), 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 to Natsumi, the dream is a predestined event in which Decade will destroy all the worlds.

Characters
As the story of Kamen Rider Decade takes place amongst many different dimensions, the characters and settings change as the series go on. The only constant characters are Tsukasa Kadoya and the Hikari family: Natsumi Hikari and her grandfather, Eijiro. However, the group is joined by various members of the A.R. Worlds that they visit.