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Takeshi Hongo, a young scientist boasting of an IQ of 600 and a racing prodigy, is abducted and his body surgically remodeled by Shocker, an evil secret society plotting for global domination.
Hongo wins the championship, but the model who brings him his bouquet suddenly bares her fangs and attacks! With growing suspicion, Hongo investigates the woman's home, and finds it has been transformed into a lab.
Shocker tests their mysterious Scorpion Man by releasing their slave workers and telling them that they can have their freedom if they can escape within 10 minutes, but one by one they die at the Scorpian Man's hands.
At an amusement park's botanical gardens, people begin to go missing. The young boy Kenji's older sister Yukie gets snatched away, and he tries to tell someone that his sister was attacked by a giant King Sarracenian!!
While a series of strange earthquakes are going on, Hongo is contacted by his childhood friend and seismologist, Amemiya Chikako, who tells him, “Something is planning to cause a major earthquake.”
Former navy lieutenant-commander Sunada is attacked by the Chameleon Man. His aim is a submarine model in Sunada's possession that has secrets relating to a Nazi treasure concealed inside.
Kamen Rider, having fallen into a pit trap, loses his power in the secret room where no wind can reach and reverts back to his form as Hongo.
Hongo begins an investigation into the series of incidents where people who had glasses made at Kagemura's Optometry store have gone missing. But even Ruriko gets some lure glasses, and she disappears as well.
Cobra Man makes an attack on the gold vault, but when the pet dog of security guard Kondo barks at him, he drops his fangs! Seeking his fangs, he attacks Kondo.
Ritsuko Ayakoji of the Ayakoji Biology Research Institute, Shocker's collaborator, puts up advertisements for “Purchasing Animals” to gather animal blood and capture the people who bring in their pets.
Shocker has produced a new monster, Gebacondor, by assembling into one all the strong points of their previous monsters. But Gebacondor needs the lifeblood of young women.
Doctor Shirakawa has invented a death ray but tries to seal his invention away, while his aid Shibata conspires with Shocker and is remodeled into the monster Geckogeras, making secret plans to take the death ray.
To break through the Toyo Atomic Energy Research Laboratory's barrier, Shocker remodels pro soccer athlete Nomoto and produces the monster Tokageron with powerful kicking might.
Hongo saved Tokyo from a horrible fate at the hands of Shocker.But Hongo can not rest while Shocker's plans to conquer the world grows stronger every day. For justice, and for everlasting peace, Kamen Rider will continue his fight until the very end. Debuting this episode, a new Kamen Rider appears! With three new leading ladies, and more excitement, Thrills, and Action!
At the end of fierce fighting, Kamen Rider drives Sabotegron away. Sabotegron then uses Flowers of Mexico to attack Hayato and the Tachibana Racing Club.
Shocker gets their hands on the Pirazaurus whose poison can kill a giant dinosaur in mere seconds and begin to create a cyborg by combining it with a human.
Pirazaurus experiments with the powerful deadly gas, “Mist of Death,” at a gogo house. He launches his scheme to obliterate Japanese leaders with the Mist of Death as they spectate a pro wrestling match.
Shocker creates a missile base in the mountains and appoints the monster Hitodanger to defend it. After saving a boy from a Shocker attack, he fights Hitodanger to save Taki who went searching for the base.
For Shocker's plan to cause a tsunami in Hokkaido through submarine earthquakes, they send in the monster Kanibubbler to destroy all seismomitors.
Ichimonji, who has started an inquiry into a village thrown into panic by a gigantic catapillar creature, meets with Yoshioka who is looking for a missing professor, and together they begin a search for the professor.
In order for Shocker to make use of a growth drug developed by Yoshioka, Dokugander's adult form transforms into the deceased professor to trick the assistant professor Yoshioka.
An olympic swimmer disappears suddenly right before the eyes of his teammates, and a young man swimming in the ocean gets kidnapped by a monster who appears.
Shocker creates the monster Musasabidol to go after a new liquid fuel developed by Doctor Ookuma. Taki, who is visiting Hokkaido, discovers this plan, and after following Taki, Ichimonji confronts Musasabidol.
After a prisoner is immersed in the extract of poisonous mushrooms for one week, the monster Kinokomorgue is born.
Kinokomorgue declares, “Make him taste the fear of death!” and injects the captured Ichimonji with the antidote, returning him to his senses.
While the monster Hell Thunder enacts his plan to make an artificial antlion pit that tears main roads into pieces, the supreme commander Colonel Zol is dispatched from Shocker's branch in the Middle East.
Children are abducted by a suspicious man who calls himself a close friend of Kamen Rider. The man is the Shocker beast Mukaderas and he controls children with hypnotic radio waves for their scheme to turn them into members of Junior Shocker.
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.
Shocker seeks humans capable of withstanding 5000 volts of electricity to make a resource of Electric Humans they can use to assassinate important figures, so Kuragedal who can release high-voltage currents is sent to capture people.
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.
Mount Tengu is the test site for the bacteria, “Amazon's Curse,” of Shocker's monster Arigabari, and they attack the young man Izaki who visits the mountain.
The monster Dokudahlian is made from a man-eating flower that's lived for 200 years in the deep forests of New Guinea and he transforms into a florist who emits hypnosis sound waves.
Dispatched from Brazil, the monster Armadillong is given the order from the Chief, “Defeat my longtime enemy Rider,” before enacting his plan to destroy gas tanks.
Doctor Origuchi of the Criminal Research Institute looks into Shocker's evil doing, and discovers their plan to split the Japanese islands with a special nuclear weapon.
Shocker's scientists succeed in producing a queen ant cyborg from an ant's egg. The created monster Archimedes attacks a bank with her powerful formic acid.
Shocker discovers a monster from the time of ancient Egypt in the pyramids, the mummy Egyptus.
Shocker's newly developed killer plants are placed in theaters and concert halls as they scheme up the G Strategy to annihilate everyone.
Captured two years ago, the marine biologist Doctor Seki created the monster Rayking but flees Shocker and is rescued by Ichimonji and the others.
Colonel Zol executes his Wolf Strategy to make werewolves with the Wolf Virus. In the midst of this, the young girl Kumiko from the Wakakusa Garden orphanage witnesses one of these experimental wolfmen.
Doctor Reaper of Shocker's Swiss branch takes up a new post in the Japanese division. He makes plans to detonate Kirishima's volcanic belt by digging an underground tunnel between Kirishima and Sakurajima.
For the construction of a tunnel that connects Sakurajima and Ebi Heights, Doctor Reaper sends in the monster Ghoster.
Doctor Reaper captures a cold-hearted young man, who doesn't even care about committing a hit-and-run to a young boy, and remodels him into the Fly Man.
Emi of the Tachibana Racing Club is taken by Shocker, fitted with a transmitter and controlled by the monster Pranodon's hypnotism radio waves.
The monster Moldbinga schemes to cultivate a killer mold that grows from the nourishment of humans and he attacks people in the graveyard near the hideout so he can conduct tests with his killer mold.
Doctor Yajima develops an artificial brain that has the power to amplify the abilities of animals exponentially and keeps it to himself.
Shocker plots their “Snow Strategy” to melt all of the snow of Kusatsu Heights and cause a great flood, and makes the physicist Doctor Mikawa manufacture an energy bomb that releases intense heat.
The monster Todogiller, who can fire a Freezing Shot that is 300 degrees below zero, freezes humans and Shocker turns them into cyborgs to execute their “Ice Strategy.”
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.
An aurora suddenly appears in the Tokyo skies. The many people who see this look towards it, and one by one they get brought in to hospitals.
Shocker infuses a unicorn brought back from a fossil with the blood of a fiendish man, creating the monster Unicornus. Unicornus turns Goro and others into fossils.
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.
Takeshi Hongo has to contend with both a new Shocker commander, Hell's Ambassador, and a plot to create chaos with a new cyborg who can control wild animals.
Shocker sets up a training camp in a village in the mountains. The monster Sea Snake Man who was trained at the camp uses the sight-warping Prism Eye to execute victims.
Shocker develops a bacteria that ages biological cells. By putting the bacteria into the balls of a bowling alley, they conduct an experiment to rapidly age young people.
The Shocker monster Gireera schemes to throw capsules packed with a deadly poison powder into Japan's national reservoirs for their “Poison Water Strategy”.
Hongo's friend Sawada completes a liquid gunpowder that can melt any metal. The Shocker monster Poisonmondo targets this gunpowder.
Doctor Ootaguro succeeds in developing the “Alpha Liquid,” a life revitalizing drug that can revive a dead organism.
From the only surviving earthworm of the Bikini Islands atomic bomb experiments Shocker creates Earthworm Man.
The Owl Man begins experimenting with the Murder X-Rays equipped in both of his eyes that can turn living things into bone.
Doctor Reaper returns to Shocker's Japan branch of Katsugawa Island along with Catfishgiller who he remodeled from an electric catfish.
With the poison needles all over his body containing a killer virus that can melt humans, the monster Hedgehoras obliterates humans one after another.
While Hongo and the others are training intensely with their sights set on winning the All Japan Motorcycle Championship, Rhinogang is dispatched from Shocker's Africa division.
While catching cicadas, Naoki witnesses a murder by the Shocker monster Cicadaminga. Hongo protects Naoki and Shocker come to attack him, but he chases them back and has a confrontation with Cicadaminga.
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.
The cyborg Longhornkid revives the monsters defeated by Rider to begin the “Devil Festival.” Through sacrifices, energy is given to Zanjio, Jaguarman, Poison Lizard Man, Hedgehoras and Rhinogang to achieve their resurrection.
Hongou discovers an upcoming meeting between important Shocker branch chiefs, but that is not all the Leader has planned.
Appearing in Japan once again, Doctor Reaper has a plan to destroy Japan by controlling a meteorite.
The monster Gillercricket has the ability to transform humans he stabs with his poisonous red claws into murderous fiends with their own death claws.
Born from high voltage, the monster Electrifirefly receives orders from Ambassador Hell to steal all of the electricity inside Tokyo.
Hongo and Taki receive communication from the FBI saying, “There are clues to Shocker in Kobe,” and so they secretly fly to Kobe in search of Shocker movement.
The new monster Mosquilas comes from South America and plots to create a Shocker base in the Kii Peninsula.
Shocker's plans to establish a base on the southern tip of the Kii Peninsula obstructed, they use Crabking to abduct the oceanographer Doctor Sakai who dreams of an undersea farm.
Tobei Tachibana becomes president and Taki acts as commanding officer of the Boys' Kamen Rider Squad that is formed. Around that time, there is an outbreak of multiple attacks at blood banks.
Taki arrives at the place where he received word of a Shocker sighting from the Boys' Rider Squad but is captured by the monster Roseranga.
Shocker packages the Seadragon monsters in “Strange Beast Monster Cans” and sends them into the homes of the Boys' Rider Squad members. The fully grown Seadragons begin attacking people with their high-voltage currents
Using his power to liquify his entire body, Shocker monster Newtgeth abducts many adult men to advance the construction of an underground airfield.
The monster Urchindogma takes over the village near Tobei's hometown in order to raise a massive amount of Urchindogma eggs. When Tobei returns to his hometown to visit a grave, he protects a young boy who is attacked by Urchindogma for being a witness.
Someone reports the Shocker monster Garagaranda's strategy to poison the water supply to Masked Rider. The Shocker Chief detects Ambassador Hell is the traitor and decides to execute him.
With Ambassador Hell's defeat, Shocker's Japan division is abandoned. However the Shocker Chief adds the power of Africa's secret organization Geldam and forms the new organization Gel-Shocker.
Gel-Shocker's Scorpiolizard uses the Shocker scientists as the guinea pigs for an oxygen deprivation gas and eliminates them. However one scientist, Takashi, does escape. Scorpiolizard pursues Takashi and attacks his wife's hospital.
Using Jellyfishwolf who can release 10 million volts of electric current, Gel-Shocker schemes to massacre people by bringing lightning down on Shinjuku station during rush hour.
Gel-Shocker remodels a death row inmate into the monster Boarbeetle. Boarbeetle possesses a madness gas and in order to succeed in their strategy to devastate Tokyo with a deadly poison gas.
Isoginjaguar, reconstructed for the purpose of destroying Rider, abducts the girl Maki who is searching for her father. During the Boys Rider Squad's search for her they find Isoginjaguar's automobile, but it's a Gel-Shocker trap.
Combining a viscious criminal with a moray eel and sea turtle that grew up in the sludge of Tago Inlet, Gel-Shocker produces Utsubogamesu.
The Boys Rider Squad come to hike Mount Oomuro. Meanwhile, Gel-Shocker's Eaglemantis executes the human hunting strategy and attacks a bus headed for Mount Oomuro, abducting the passengers.
Gel-Shocker draws up a list of Japan's important figures to execute. The monster Kumolion delivers letters of advance notice for their deaths to these figures and then assassinates them one by one.
Hongo consults with the young boy Satoru who is concerned about his older brother since he's become obsessed with painting a black cat, but at that moment, Nekoyamori appears out of the black cat paintings decorating the room.
Gel-Shocker's Canarycobra transforms into a tiny canary and approaches people, then kills them with the deadly poison of his Cobra Hand.
After defeating Canarycobra, Nezucondor appears before Kamen Rider. Nezucondor carries the plague inside his body and impliments the pet strategy to spread it throughout Tokyo.
Hongo learns from the Boys Rider Squad members of strange occurances in the Tanzawa district and heads to the scene, but he is attacked there by Boys Gel-Shocker Squad.
Kamen Rider and Mukadetiger simultaneously vanish. At that time, the Gel-Shocker Chief determines the real identity of the Anti-Shocker Alliance that has continuously disrupted Gel-Shocker activity.
Kamen Rider #1 is driven back by the Shocker Rider and the monster Haetoribachi's coordination and sinks under the sea with Haetoribachi.
Wih the Anti-Shocker Alliance's back up, the double Riders are able to escape danger and take Raydokuga prisoner. Moreover, to defeat Shocker Rider, they begin special training under Tobei's tutelage.
Gel-Shocker's Garaox uses his demon fog that can make objects float to attack vehicles. Hongo saves a man who is dropped from midair and questions how despite using a highway he wound up falling from the sky.
The cactus research expert Doctor Matsuda is remodeled into Cactusbat. Cactusbat attacks the World Peace Committee's members and using the thorns on his arms he turns the people into cacti.
The Gel-Shocker monster Leechameleon uses the blood absorbed from humans to resurrect Ganikomol who once defeated Rider. Learning of this, Hongo embarks for the enemy's lair, but the revived Ganikomol is there waiting for him.
With the arrival of Masked Rider #2 Hongo is rescued and the Double Riders showdown against Leechameleon.