Shocker schemes to turn Tokyo Bay into a sea of flames by pouring in petroleum from industrial areas, equipping the monster Mogurang with an Electro Eye that he uses to capture humans.

Doctor Shimura's research that can revive ancient lifeforms catches the eye of Shocker, who steal the ancient trilobite ressurected from a fossil and infuse it with the blood of a blood-sucking cyborg, creating the monster Zanbronzo.

With the blood-sucking leeches he controls the monster Leechguerilla absorbs the lifeblood of humans, and by injecting a green medicine into them he can change the humans he takes blood from into slaves.

The old man Nakayama finds a vein of diamonds in the continent of Africa and sends the whereabouts of the vein to his grandchild written on a medal, but Shocker targets the vein as well.

Gilgalass transforms himself into a crow that can speak like a human, and attacks humans with the Dead Man Gas that turns them into homicidal maniacs.

The Owl Man begins experimenting with the Murder X-Rays equipped in both of his eyes that can turn living things into bone.

Deceiving them with the slogan, “Come catch Masked Rider and beetles!” Shocker kidnaps children to Mount Takao where Shocker's insect expert Beetlelong organizes a Shocker school and turns them into his pupils.

A Destron fugitive calls Rider Scouts HQ to reveal a sinister plot, but the line goes dead. Discovering a locker key at the scene, Kazami Shiro is ambushed by Bloodthirsty-Mammoth, but escapes. Shiro retrieves photographs of three members of parliament whom Baron Fang plans to brainwash in order to conquer Japan. So he disguises himself as one of the men and is taken to Destron's outpost. Can V3 stop Baron Fang's diabolical plot?

Destron summons Archbishop Wing and his clan from Tibet to take over where Baron Fang failed. Soon afterwards a strange Buddhist monk claims that evil spirits reside in the homes of the president of an industrial factory and the director of an atomic research facility � the evil spirits turn out to be mutant Flame-Condor. When V3 is injured in battle, Tachibana Tobei helps him to train against the airborne menace. Can V3 overcome the odds?

Archbishop Wing plans to use the poison of the inhuman Plantaingan, combined with 30,000 volts of electricity, to create miniaturized people preserved for use in creating cyborgs. The mutant kidnaps a young boy's sister and Kazami Shiro must fight in order to save her. Plantaingan attacks Rider Scouts HQ to liquidate a captured Destron Soldier and threatens Tachibana Tobei and Company. Can V3 liberate them from the tendrils of death?

Destron mutant Deadman-Bat, employing a virus called the Himalayan Devil, turns the residents of apartment complexes in all the major cities into vampire slaves. When Rider Scout Kiyoshi discovers his older brother is one of the victims, he and Shigeru are attacked by the mutant. V3 challenges Deadman-Bat, but is tossed from the air and Kiyoshi is injured. Can V3 develop a new technique in order to defeat the true form of Archbishop Wing?

Ambitious Destron scientist Yuki Joji is condemned to death by Marshal Armor, who sees him as a threat to his position in the organization. Slowly Yuki is lowered into a pool of sulfuric acid, losing his right arm before being rescued by his fellow scientists, who make a daring escape. Hidden away, Katagiri contacts his sister, who is a nurse, to assist in Yuki's cybernetic operation. But Destron is watching and sends Sickleneck-Tortoise to kill them�

V3 saves Riderman from Sickleneck-Tortoise's nerve gas in the nick of time. Regardless Riderman doesn't want to listen to V3's words against Destron � he only seeks revenge against Marshal Armor. Meanwhile, Marshal Armor begins his plan to spread the nerve gas and begins killing innocents throughout Tokyo, and while Kazami Shiro investigates with Yuki Joji right on his tail, Sickleneck-Tortoise stalks them both�

Destron mutant Chameleon shoots Yuki Joji, but Kazami Shiro takes the bullet. Soon Shiro becomes unable to control his strength and becomes a menace. Meanwhile, Chameleon's human form uses a naive country girl to ensnare the vulnerable Shiro. In order to remove the Vatal Bullet from Shiro's skull, they must infiltrate Destron's Tokyo outpost. But, Marshal Armor and Chameleon are waiting to welcome them�

Mutant Chameleon is resurrected as Vampire-Chameleon and Marshal Armor sends him on a mission to collect the blood of innocent children. Kazami Shiro befriends young Kenichi, who is despondent because he believes that he has seen a mutant. When Vampire-Chameleon attacks Kenichi's grammar school, Shiro and Joji find themselves in a dilemma, when they face a horde of vampire children they cannot kill�

Marshal Armor has developed a powerful Pluton Rocket that is more powerful than the H-Bomb and the Great Leader orders that it be aimed at Tokyo. Shiro and Joji become suspicious when a group of mountaineers are killed mysteriously in a remote valley. While investigating, they are attacked by mutant Crawganna who protects the Destron missile base. But, V3 and Riderman fail to stop Marshal Armor from starting the cataclysmic countdown�

The Great Leader initiates "Operation: D", a final, all-out offensive to seize control of Japan. Destron revives Deadman-Bat, Fireball-Walrus and Plantaingan who attack Rider Scouts HQ and kidnap Junko and the Scouts. Meanwhile, Kazami Shiro has discovered Destron's headquarters where dwells the Great Leader, but the mutants bury him in a mound of dampening powder made from special alloys. Even if V3 escapes their trap, Crawganna awaits�

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Amazon continues to bemoan his problems while being pursued by a strange beastman mole sent by Gedom.

Amazon and Mole Beastman become further connected when protecting a mysterious Incan rope-message with the secret of Gedom.

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