A plane crashes in the Amazon rainforest, leaving young Daisuke Yamamoto stranded without his parents. Soon adopted by an Incan tribe under the name "Amazon", he becomes a wild child, living off the land. However, his village is massacred by the Ten-Faced Demon Gorgos, who searches for the powerful GiGi Armlet to take over the world with it. The last Inca, Elder Bago, gives Amazon the GiGi Armlet for safekeeping and uses his knowledge of Incan science and magic to perform a mystic ritual on Amazon and transform him into the powerful "Kamen Rider Amazon" before dying. Now in Japan, Amazon battles the evil organization Gedon, unaware of why they pursue him. Befriending Professor Kousaka's nephew and niece, Amazon learns of the GiGi Armlet's true nature and ultimately defeats Gedon, then the Garanda Empire.

Doctor Keitaro Shido, an acclaimed scientist, has been kidnapped by the terrorist organization Neo-Shocker to exploit his expertise in robotics technology. Desperate to escape, he convinces Neo-Shocker's command to allow him to operate on an injured camper. Explaining that he can turn the camper, Hiroshi Tsukuba into a powerful Neo-Shocker warrior, they allow Doctor Shido to operate. However, he quickly turns the tables on them, transforming Hiroshi, not into a kaijin, but the powerful warrior Sky Rider, using his newfound abilities to combat the evil Neo-Shocker menace.

Set primarily before the events of Kamen Rider W Forever, Kamen Rider Eternal tells the story of Daido Katsumi, the formation of NEVER, the mission that led them to target Fuuto, and reveals just how Daido obtained his Lost Driver and got his first taste of the power of Kamen Rider Eternal. As a mysterious woman retells this story to Phillip and Shotaro, they realize that Daido may not have been the simple monster he first appeared to be…

One year after the battle days of Sword of Logos ended, Reika Shindai is preparing for her wedding. However, this happiness is unexpectedly abrupted when her brother Ryoga receives some disturbing details about the upcoming wedding.

A continuation from the Kamen Rider Ghost TV series, this is the story of Makoto, Alain, and Kanon who have traveled back to the Ganma World. It will explain the connection between Makoto and the Makoto doppelganger. Kanon’s secret will be revealed as well.

In the near future, the resurgence of ninjitsu in Japan sets the stage for the adventures of Rentaro Kagura, Kamen Rider Shinobi!

A mysterious person restarts the Mirror World's Rider Battle, thus making Shinji Kido and other war participants regain their memories and transforming abilities. With the appearance of Another Ryuki, Sougo Tokiwa and Geiz Myokoin investigate this event, becoming involved in the war themselves...

Kamen Rider 4 is a web series which was released as an accompanying special to the film Super Hero Taisen GP: Kamen Rider 3. It introduced a new rider, Kamen Rider 4, who is the fourth Kamen Rider cyborg created by Shocker after Kamen Riders 1, 2, and 3. The plot goes around a time loop created by the Shocker that resets whenever someone dies, but whenever the loop resets Shocker itself somehow grows stronger and stronger. Thus, it is up to the Riders to decide whether to keep on fighting a useless battle... Or end the loops for good by sacrificing one of their own.

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.

Shigeru Jo joins the evil organization Black Satan after the death of his close friend and mentor Goro Numata. He, promised power, and fueled by a desire for revenge, undergoes surgery to become one of Black Satan's super warriors. However, Shigeru knows that Black Satan were in fact the murderers of his friend; he was using Black Satan in order to gain new powers. The newly powered up Shigeru escapes from the Black Satan headquarters before they can brainwash him into following their campaign of evil and becomes Kamen Rider Stronger. While escaping from Black Satan, Stronger meets Yuriko Misaki another cyborg warrior created by Black Satan who has the ability to transform into Electronic Wave Humanoid Tackle. Together they fight the evil Black Satan and later the Delzer Army to restore peace in Japan.