Kamen Rider Decade

Rider War: Prologue (1x30)

Air date: Aug 23, 2009

The Hikari Studio has arrived to find Kiva and Blade's Worlds merging, the two fighting each other—Riders and monsters together—to keep their world from disappearing as a result. Can Tsukasa convince Kazuma and Wataru that Dai-Shocker is the true enemy before Apollogeist can merge all of the Rider Worlds?