During a motocross practice, Keisuke Jin is ambushed by two Myth Cyborgs created by a secret organization that's attempting to control Japan, G.O.D. (Government of Darkness). He transforms into Kamen Rider X, but little does he know that his battle is recorded and analyzed by King Dark, G.O.D.'s commander, to create a super cyborg. Other G.O.D. cyborgs are attacking all over Tokyo and in the middle of the crisis, the original four Riders return to Japan from different countries around the world. The five Riders unite to lead a counter attack against G.O.D.
速水亮
as Keisuke Jin / Kamen Rider X
藤岡弘、
as Takeshi Hongo / Kamen Rider #1
佐々木剛
as Hayato Ichimonji / Kamen Rider #2
宮内洋
as Shiro Kazami / Kamen Rider V3
山口豪久
as Jôji Yûki / Riderman
小林昭二
as Tobei Tachibana
Ayao Wada
as King Dark (voice)
Miyuki Hayata
as Mako
仁和令子
as Chisako (as Chisako Kosaka)
Kenshi Kobane
as Masaru
Jun Mizunoe
as Etsuko
Yukio Fujino
as Masaru's Father
