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 tokusatsudramas. 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 Super Sentai Series, Samurai Sentai Shinkenger in 2009. 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?).
"Destroyer of Worlds, Decade. What do those eyes see as he travels through 9 worlds?"
―Narrator (Nine worlds Arc)
"Destroyer of Worlds, Decade. What do those eyes see as he travels through many worlds?"
―Narrator (New worlds Arc)
The story revolves around the nine previous universes of the Kamen Riders from the Heisei era 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 Kaito, they are joined by Yusuke Onodera of the World of Kuuga and Kivala of the World of Kiva.
In an interview in the March 2009 issue of Kindai Magazine, Masahiro Inoue stated that Decade was slated as having only 30 episodes. A subsequent interview in Otonafami magazine confirms that only 30 episodes were filmed. The final episode count as stated in TV-Kun is 31. Episodes that are tributes to the previous Kamen Riders will have episode titles similiar to that particular season of Kamen Riders (this was became the same as Kaizoku Sentai Gokaiger).
Generally, episodes of Decade are titled similarly to the episodes of the series that they reference. Kamen Rider Kuuga's episodes were titled with only two kanji and episodes of Kamen Rider Kiva have a musical reference and musical notation in the title. For the World of Hibiki story arc, the episode title cards are stylized in calligraphy similar to the styles featured in Kamen Rider Hibiki. An episode arc also features a crossover with Samurai Sentai Shinkenger.
In case, episodes that are tributes to the previous Kamen Riders will have episode titles similiar to that particular season of Kamen Riders (this was later became the same as Kaizoku Sentai Gokaiger).
Rider War (ライダー大戦,Raidā Taisen?) (First introduction of Characters)
For Decade's S.I.C Hero Saga side story Masked Rider Decade: World of Stronger (MASKED RIDER DECADE─ストロンガーの世界─,Kamen Raidā Dikeido -Sutorongā no Sekai-?) tells of how Tsukasa and the Hikari Studio crew enter the reality in which Kamen Rider Stronger takes place and meet up with the characters within, such as the original Yuriko Misaki. The first episode was published in Hobby Japan, June 2010.