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.” 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.
Characters
Keisuke Jin (神 敬介, Jin Keisuke): The son of Keitaro Jin, Keisuke suffered mortal injuries inflicted by G.O.D when they attacked the Jins. As a result, with his father's final breath, Keisuke was made into an advanced cyborg developed for marine exploration called a "Kaizorg" (カイゾーグ, Kaizōgu) named Kamen Rider X. Driven to avenge his father's death and save the world, X battles G.O.D..
Tobei Tachibana (立花 藤兵衛, Tachibana Tōbee): The mentor of the previous Kamen Riders.
Ryoko Mizuki (水城 涼子, Mizuki Ryōko): Keisuke's fiancée, Keitaro's assistant, and a G.O.D. member. She and her twin sister Kiriko are
Interpol agents investigating G.O.D., Ryoko joining the organization to spy on it while allowing herself to be turned into a cyborg. But Ryoko is forced to expose herself while protecting a child from Strong Arms Atlas and is destroyed by the G.O.D. General soon after.
Kiriko Mizuki (水城 霧子, Mizuki Kiriko): Ryoko's twin sister who is an Interpol investigator. She died protecting Keisuke from Strong Arms Atlas' arrow.
Chiko (チコ, Chiko): A student of Johoku University and Tobei's coffee shop worker.
Mako (マコ, Mako): Chiko's friend and Tobei's coffee shop worker.
Keitaro Jin (神 敬太郎, Jin Keitarō): Keisuke's father, a robotics genius who trained his son with the two having a strained relationship. Refusing to join G.O.D when his technology attracted their attention, Keitaro is fatally wounded and turned his dying son into a cyborg to save his life. Prior to his death, Keitaro copied his mind into a super computer within the Jin Station which he intended to help Keisuke through. But the Jin Station acted on Keitaro’s thought process to self destruct to keep Keisuke from being overly dependent on it.
G.O.D.
The G.O.D. Secret Organization (GOD秘密機関, Goddo Himitsu Kikan), short for the Government of Darkness (暗黒政府, Ankoku Seifu), is the evil organization supported by foreign nations.
G.O.D. General Commander (GOD総司令, Goddo Sō Shirei): A mystery man who commands the G.O.D. operatives through taped messages placed in various objects that self-destruct upon relaying his instructions.
Apollogeist (アポロガイスト, Aporo Gaisuto, 8-14): The Chief of Security of G.O.D., armed with the Geist Cutter shield and the Apollo Shot shogun, his human appearance wears a white tuxedo with black gloves until he invokes "Apollo Change" (アポロチェンジ, Aporo Chenji). He destroyed himself using his Arm Bomb after he was defeated by X's Finishing Kick.
Apollogeist Reborn (再生アポロガイスト, Saisei Aporo Gaisuto, 16-21): Revived by two doctors of G.O.D. Armed with the Apollo Magnum bayonet on his right hand, the Geist Cutter shield, and the small Geist Cutter shield on his left shoulder. He was destroyed by X's X Kick.
King Dark (キングダーク, Kingu Dāku, 21, 22, Movie, 32 & 35): The leader of G.O.D., he reveals himself after Apollo Geist's destruction, mocking X. He was destroyed by a self-destroying function that Dr. Noroi started.
Dr. Noroi (呪博士, Noroi Hakase, 35): Dr. Noroi is revealed to be the leader of the Government of Darkness. He was destroyed in King Dark's destruction after being stabbed by X's Ridol Whip.
G.O.D. Warfare Agents (GOD戦闘工作員, Goddo Sentō Kōsakuin): Warriors who serve as foot soldiers for the Government of Darkness. Not only do they carry spears, they also wield pistols and machine guns.
Reedited episode 3. A little girl named Sayoko witnesses the murder of an Interpol agent by the G.O.D. kaijin Hercules. Keisuke Jin saves her before Hercules disposes of her. Sayoko tells Keisuke that G.O.D. is targeting an important official named Kibara. Kamen Rider X has his hands full when G.O.D abducts Kibara and takes Sayoko and her mother hostage.
Five Riders vs. King Dark (五人ライダー対キングダーク, Gonin Raidā Tai Kingu Dāku)
During a motocross practice, Keisuke Jin is ambushed by two of G.O.D.'s kaijin warriors. He transforms into Kamen Rider X, but little does he know that his battle is recorded and analyzed by King Dark to create a super kaijin. Meanwhile, other G.O.D. kaijin are attacking children all over Tokyo. But before the other Riders intervene, the kaijin mysteriously disappear. Upon learning about King Dark's latest plans, Kamen Rider X joins forces with the four Riders to stop G.O.D. and their revived kaijin.
S.I.C. Hero Saga
The
S.I.C. Hero Saga story for Kamen Rider X was published in Monthly Hobby Japan magazine in its July to September 2009 issues. The story was titled Masked Rider X: Son of Zeus (MASKED RIDER X -ゼウスの息子-, Kamen Raidā Ekkusu: Zeusu no Musuko).