日本壊滅を図る暗黒組織「GOD」は、Ｘライダーを倒すべく、新怪人、キングダークを登場させる。苦戦を強いられるＸライダー。彼を助けるために1号、2号、Ｖ3、そしてライダーマンが集う!テレビでも実現しなかった歴代のライダー五人が初競演した1974年製作映画。
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. He transforms into Kamen Rider X, but little does he know that his battle is recorded and analyzed by Kingdark, 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. and fight its newest monster.
