Kamen Rider Specials

Kamen Rider 1 Through RX: Big Gathering is a TV special which covers all the Kamen Riders, from Kamen Rider 1 until ZX and introduces Kamen Rider Black RX. Though a TV special airing in the gap between the final episode of Black and the first episode of Black RX, it was variously treated as the end of Black and the start of RX.

The OVA begins with the Kamen Rider squad called the Battle Riders, consisting of Black RX, Rider 1, and ZX destroying a GranShocker soldier factory, after which Rider 1 decides to speed around the race track whilst Black RX and ZX gamble. After being beat up by ZX for welching on his losses, Black RX reveals he has fallen in love with Michiru, an instructor at a local Sportsclub.