The Crisis Empire devise a plan to defeat Kotaro Minami by reverting him back to his old form of Kamen Rider Black and sending out several revived monsters after him. However, Kamen Rider Black is assisted by another RX, who used a time warp to help his past self. The two are joined by RX's alternate forms of RoboRider and BioRider and the four Kamen Riders combine their powers to defeat the revived monsters.
Practical Effects
Four distinct Rider suits sharing one cramped screen
Stunts
Kurata fighting himself through sheer editing magic
Production
Time warp logic that makes zero sense and rules
Director
Yoshiaki Kobayashi
Tetsuo Kurata
Kotaro Minami / Kamen Rider Black RX / Kamen Rider Black
Seizo Kato
General Jark (voice)
Atsuko Takahata
Maribaron
Shozo Iizuka
Bosgun (voice)
Kazunori Arai
Gedorian (voice), Gynagiskhan (voice)
Eisuke Yoda
High Priest Darom (voice), Musalabisala (voice), Tripron (voice)
Hitomi Yoshii
High Priestess Bishum
Trivia, insights & behind the scenes
This short premiered alongside the Kamen Rider Black RX movie, making it one of the earliest instances of a Rider meeting his own previous form — years before Decade made it a franchise staple.
The four-Rider team-up shot directly influenced how later crossover films like 'All Riders vs. Dai-Shocker' would frame hero gatherings as spectacle-first events.
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