Kamen Rider X (仮面ライダーX Kamen Raidā Ekkusu?), translated as Masked Rider X, is a Japanese tokusatsu superhero television series. It was broadcast in 1974 on NET (now known as TV Asahi). It is the third entry in the Kamen Rider Series of tokusatsu shows. It starred Hayami Ryo in the title role.
Robotics scientist Keitaro Jin and his son Keisuke become caught up in the campaign of terror by an evil organization known as "G.O.D.". They are attacked and the professor's technology stolen, but before Keitaro dies, he is able to perform surgery on his son. With the last of his robotics technology, he transforms his son into "Kamen Rider X". To avenge his father's death and ensure the safety of the entire world, Keisuke uses this technology as he battles the monstrous minions of G.O.D.