 This article is about an event in Kamen Rider Decade.
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- For the episodes of Kamen Rider Decade that feature this war, see Rider War (episode) and Rider War: Prologue.
The Rider War (ライダー大戦, Raidā Taisen) was a cataclysmic event that occurred during the merging of the A.R. Worlds in the World of the Rider War.
After Tsukasa Kadoya traveled to multiple A.R. Worlds, Wataru Kurenai appeared before him saying that in order to stop the merging of the worlds, his true derivative was top defeat the Nine Heisei Riders in order for these worlds' stories to unite with each other through him. However as a result of him befriending the Riders of each world instead, the merge inevitably occurred and the A.R. Worlds' Riders faded away (with the exception of Yusuke Onodera).
After being attacked by the original Riders, Tsukasa realized what needed to be done, thus allowing Decade's base form to evolve. Known as Decade Violent Emotion, this form allowed him access to every Kamen Rider's powers without needing to transform into its respective Rider (e;g AttackRide: Clock Up without needing to transform into Kabuto first). With this new power, Decade became more aggressive. One by one, he hunted the Riders in order to fulfill his true mission, separating himself from the others.
After defeating the pre-Decade Riders, Tsukasa allowed Kamen Rider Kiva-la to mortally wound him, so that Natsumi can become the connection between the Riders and the Rider War would end in Decade's death.
Participants[]
| Kamen Rider Decade | Tsukasa Kadoya |
| Kamen Rider Diend | Daiki Kaito |
| Kamen Rider Kuuga | Yusuke Onodera |
| Kamen Rider Agito | Shoichi Tsugami |
| Kamen Rider G3‑X | Makoto Hikawa |
| Kamen Rider G4 | Shiro Mizuki |
| Kamen Rider Ryuki | Shinji Kido |
| Kamen Rider Zolda | Shuichi Kitaoka |
| Kamen Rider Ryuga | Mirror Image Shinji |
| Kamen Rider Faiz | Takumi Inui |
| Kamen Rider Kaixa | Masato Kusaka |
| Kamen Rider Delta | Syuji Mihara |
| Riotrooper | Multiple Users |
| Kamen Rider Psyga | Leo |
| Kamen Rider Orga | Yuji Kiba |
| Kamen Rider Blade | Kazuma Kenzaki |
| Kamen Rider Garren | Sakuya Tachibana |
| Kamen Rider Chalice | Hajime Aikawa |
| Kamen Rider Glaive | Junichi Shimura |
| Kamen Rider Lance | Shin Magaki |
| Kamen Rider Hibiki | Hitoshi Hidaka |
| Kamen Rider Ibuki | Iori Izumi |
| Kamen Rider Touki | Touki |
| Kamen Rider Kabuto | Soji Tendo |
| Kamen Rider TheBee | Masato Mishima |
| Kamen Rider Drake | Daisuke Kazama |
| Kamen Rider Sasword | Tsurugi Kamishiro |
| Kamen Rider Gatack | Arata Kagami |
| Kamen Rider Caucasus | Issei Kurosaki |
| Kamen Rider Hercus | Hidenari Oda |
| Kamen Rider Ketaros | Tetsuki Yamato |
| Kamen Rider Den-O | Ryotaro Nogami |
| Kamen Rider Zeronos | Yuto Sakurai |
| Kamen Rider Kiva | Wataru Kurenai |
| Kamen Rider Ixa | Keisuke Nago |
| Kamen Rider Rey | Takato Shiramine |
Gallery[]
Notes[]
Narutaki compares the Rider War with the Legend War
of Kaizoku Sentai Gokaiger.
- The Rider War of Decade and the Legend War
of Kaizoku Sentai Gokaiger, which saw the first 34 Super Sentai, the predecessors of the Gokaigers, joining forces and sacrificing their powers (which resurfaced as Ranger Keys) to destroy the invasion armada of the Space Empire Zangyack, were noted by Narutaki as one of the similarities between Decade and Gokaiger in the Super Hero Taihen net movie The Grown-ups’ Narumi Detective Agency Ep. 1: Is Gokaiger a Ripoff of Decade?.
- Following on from Decade's Rider War and Gokaiger's Legend War is the Dark Spark War of Ultraman Ginga, which celebrates the 50th anniversary of Tsuburaya Productions.
- Following on from Decade's Rider War and Gokaiger's Legend War is the Dark Spark War
- Many other Riders not seen on-screen are possible participants of the war, who may or not have have survived.
- The first level of the Kamen Rider: Battride War game, even having Wizard fight the first nine Heisei Riders, and even shots depicting the defeat of some Riotroopers.