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G.O.D., a secret organization, is planning to conquer the world, but a new hero, Kamen Rider X, stands in their way.

As Keisuke Jin is troubled by no longer being human, a mysterious sound causes everyone who hears it to become violently homicidal.

After a new monster named Hercules is dispatched by G.O.D. to kidnap a foreign envoy, Kamen Rider X devises a plan to rescue him.

To obtain "Alpha Gas," G.O.D. kidnaps a scientist’s daughter, leaving Kamen Rider X to rescue her.

To stop G.O.D.'s latest scheme involving the kidnapping of children, X Rider teams up with a man who has a history of assisting Riders.

When G.O.D.'s newest plan claims a bus full of innocents, Jin Keisuke gives it his all to protect the orphaned daughter of two of the victims.

Jin Keisuke sets out to discover the cause behind a string of deaths involving elementary and middle school aged children jumping from great heights.

As the fight with G.O.D. continues, Jin Keisuke finally learns the truth behind Ryoko's actions.

Kamen Rider X must face G.O.D.'s newest monster, Achilles, in order to protect a young girl fleeing from their experiments.

After his training with Tachibana, X Rider sets out for a rematch with Achilles, but Apollo Geist has more plans in store.

As money vanishes across the city, Kamen Rider X must face G.O.D.'s new Hydra monster.

When G.O.D. kidnaps a psychic girl and her mother to force her father’s cooperation, Kamen Rider X and Tobei Tachibana step in to save them.

As G.O.D. makes plans to release a killer smog across Tokyo, a new monster named Ulysses is dispatched to distract Kamen Rider X.

When Apollo Geist begins to hatch ancient insects that will plunge humanity into madness, Jin Keisuke charges into battle to save Tachibana.

Keisuke obtains information about a secret G.O.D. base, the Palace of Apollon, and infiltrates it.

X Rider has infiltrated the Palace of Apollon, where the supposedly dead Apollo Geist awaits. Meanwhile, G.O.D.'s monster Kerberos targets Tachibana Toubei with his Fire Plan.

Kamen Rider X must face a new terrifying G.O.D. monster turning people into trees!

A black cat spreads a mysterious virus, transforming city residents into cat-people.

It is a special episode which acts as a recap of the Kamen Riders up to X-Rider, as well as featuring the return of Shiro Kazami (Kamen Rider V3), who will assist X in his fight against G.O.D..

Following the return of Shiro Kazami (Kamen Rider V3) in the previous episode, it debuts a permanent upgrade for X-Rider.

Keisuke accidentally helps Dr. Yan daughter and entrusts her to Tobee. However, the true identity of the girl was the monster Centipede Youkihi. Kamen Rider X raids G.O.D.'s hideout to save Tobee who was taken hostage. Kamen Rider 2 and Kamen Rider V3 also join the battle.

Finally, G.O.D. gets all the blueprints of Dr. Nanbara's RS Device and completes it. Kamen Rider X challenges a deadly battle to destroy the device at the expense of his life. However, as the G.O.D. attack intensifies, the giant Kingdark finally begins to move...