Kamen Rider Black
In the film, the Crisis Empire devises a plan to defeat Kohtaro 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 Black RX, who used a time warp to help his past self. The two are joined by Black RX's alternate forms of Robo Rider and Bio Rider, and the four Kamen Riders combine their powers to defeat the revived monsters.