Rider Battle

The Rider Battle (ライダーバトル) was a tournament fought in the World of Decade, the home world of Kamen Rider Decade, Tsukasa Kadoya. Its purpose was to determine the strongest Kamen Rider in existence.

Prelude
When the Hikari Studio arrived in a new A.R. World which they discovered to be the World of Decade. Tsukasa remembered the mansion depicted on the backdrop that took them here. Tsukasa, accompanied by Natsumi Hikari and Yuusuke Onodera, met a girl named Sayo, who identified Tsukasa as her older brother. Her caretaker Nobuhiko Tsukikage arrives and confronted him about leaving his sister alone for so long. But when the Nine Worlds fusion started to influence the World of Decade, Tsukikage revealed that Tsukasa's journey now enabled a solution to the crisis by determining the strongest Kamen Rider in existence: the Rider Battle. When his memories returned, Tsukasa gave Tsukikage the clearance to make it happen.

Known Battles

 * Decade vs. Amazon (Decade victory)
 * Decade vs. Black (Decade victory)
 * Kuuga vs. X (Kuuga victory)
 * Ryuki vs. ZX (Outcome unknown)
 * Blade vs. Stronger (Outcome unknown)
 * Ixa vs. Skyrider (Outcome unknown)

Final Battle
Three days after the start of the tournament, after numerous matches, it came down to a 6-man tag team match between the team of Decade, Kuuga, and Diend vs. V3, BLACK, and Super-1. With Diend running off and Kuuga wounded, Decade was forced to defeat all three on his own.

Aftermath
Upon victory, a castle emerged from the stadium with Yusuke and Natsumi finding themselves in the throne room surrounded by various monsters as they were welcomed to Dai-Shocker. It turned out that before losing his memory, Tsukasa was the Great Leader of Dai-Shocker. Revealing all of their actions were to ensure Dai-Shocker would achieve its goal of dominion of all the saved worlds, Tsukasa sent the horrified Natsumi and Yusuke into the sewers.

Participating Riders

 * The participating Riders were listed in alphabetical order.