It is the third entry in the Kamen Rider Series of tokusatsu shows.

[1] Robotics scientist Keitaro Jin and his son Keisuke become caught up in a campaign of terror by an evil organization known as "G.O.D.".

They are attacked and the professor's technology gets stolen, but before Keitaro dies, he performs surgery on his son, using the last of his robotics technology to transform Keisuke into the “X-Rider.”[2] 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.’s Japan branch.

Secret Organization (GOD秘密機関, Goddo Himitsu Kikan), short for the Government of Darkness (暗黒政府, Ankoku Seifu),[6] is the evil organization supported by foreign nations.

Hero Saga story for Kamen Rider X was published in Monthly Hobby Japan magazine in its July to September 2009 issues.