Ryo Murasame is an aircraft pilot, one day he was taking his sister out on a ride along the Amazon when they were shot down by an UFO. They survived, captured by the Badan Empire with his sister killed while Ryo became the Combat Roid known as ZX. His memory is erased by the Badan Empire and worked as their agent of evil. This does not last long as an accident occurs which causes Ryo to regain his memory and escapes Badan. A year later, Ryo begins his attack on Badan as they finish the preparations on their doomsday weapon: the Space Break System. However, a coordinated attack by the Kamen Riders disables the Badancium 84 supplies needed for Space System to work When Ryo arrives, he thinks Kamen Rider V3, Riderman and Kamen Rider Super-1 are enemies until they get him to listen as only one truck full of Badancium 84 makes it to the Badan's base run by Ambassador Darkness.
菅田俊
as Ryo Murasame / Kamen Rider ZX
宮内洋
as Shiro Kazami / Kamen Rider V3
高杉俊介
as Kazuya Oki / Kamen Rider Super-1
池水通洋
as Takeshi Hongo / Kamen Rider 1
佐々木剛
as Hayato Ichimonji / Kamen Rider 2
中屋敷哲也
as Eisuke Mikage / Tiger-Roid
潮健児
as Ambassador Darkness
納谷悟朗
as The Generalissimo of Badan
中江真司
as Narrator
Eiji Karasawa
as Dr. Hajime Kaidō
Yumiko Miyake
as Rumi Ichijō
Toshie Fukushima
as Shizuka Murasame
