Kikaider battles Gray Rhino King, and when he returns to the lab where Dr. Komyoji and Mitsuko work, Professor Gill sets it ablaze.

Kikaider faces Green Mantis, who is planning a killing rampage to discredit Dr. Komyoji.

Although hindered by the sound of a Gill's flute, Jiro changes into Kikaider in order to battle Orange Ant.

Yukiko attempts to sneak away from the Destructoids to visit her daughter, but she is thwarted by Blue Buffalo.

Prof. Gill uses Yellow Jaguar to assassinate the head of the Green Project, in order to get enough carbon dioxide for his bomb.

The Destructoids begin to gather up humans to be used by Black Horse, and Mitsuko and Masaru fall into their hands.

Bull Kong kills a man who has been campaigning against the Destructoids, and Dr. Komyoji is framed.

In order to develop his evil apparatus, XR4, Prof. Gill orders Carmine Spider to find a child with Rh negative blood.

Red Condor kills everyone in a rural village in order to set up a base on which to conduct experiments on a biological weapon.

Scorpion Brown has stolen a newly developed weapon from the Nakabori Laboratory and DARK plans to mass produce it.

Mitsuko and Masaru are captured by Gold Wolf and Jiro is seriously injured by him when he tries to save them.

Professor Gill sends Silver Cat in search of some ancient treasures that hold the secret to increasing the capabilities of the androids.

Prof. Gill orders Pink Tiger to find the secret robot part that Dr. Komyoji has hidden away.

Prof. Gill recreates the 13 Destructoids defeated by Kikaida, and gives them three times their original power in order to test them against Silver Tortoise.

Golden Bat approaches Mitsuko and Masaru in the form of Taro, their older brother, who was supposedly killed by DARK.

Destructoid Rouge Jellyfish is conducting experiments with poisonous mini-jellyfish in a polluted river.

Under orders from DARK, Red Hornet begins spraying toxic gasses aimed at destroying the environment.

Black Chameleon manages to hijack a load of atomic uratonium. Pursued by Jiro, he takes Mitsuko and Masaru hostage.

King Crab Maroon steals a 50-carat emerald ring which he needs to complete his new weapon.

Blue Water Scorpion adds a toxic substance to the drinking water, in order to turn the people into puppets of DARK.

Purple Rat steals into a laboratory dedicated to communicable diseases in order to create a new DARK plague.

White Saw Shark takes over an apartment complex and sets up a laser gun. Prof. Gill's plan is to shoot down a plane filled with special fuel into a densely populated area.

The Yellow Antlion Brothers create the "Alphabet Attack" strategy in order to stop the wedding of a robotics scientist.

Pink Armadillo transforms itself into a voluptuous woman to entice men and implant control devices in their brains.

Convinced by Prof. Gill that Kikaider has killed his children, Dr. Komyoji creates Orange Snail to avenge their deaths.

Kikaider saves Dr. Komyoji from Green Mammoth, but Mariko is kidnapped, and Kikaider gets sprayed with an oxidizing agent.

Dr. Araki, who has perfected the conscience circuit, is attacked by Violet Turbo. Jiro tries to save him, but is thwarted by Prof. Gill.

Kikaider saves Masaru from Red Devil Stinger, but gets infected by a corrosive bacteria.

Masaru is saved by a girl named Kaori as he is being pursued by Green Sponge. Kaori believes Masaru is a runaway, and declares she'll run away too.

Crimson Squid pursues brilliant young robotics expert named Shimamura Chidori. He intends to implant her brain in his own body.

Prof. Gill orders Golden Octopus to hasten the construction of their secret base. Kikaider tries to save a father and daughter from DARK henchmen.

Kikaider, who has lost an arm, battles with Blue Electric Eel, and finally manages to tear an arm off the destructoid.

Mask Crab Red tries to kill Mitsuko, but he is thwarted by King Crab Maroon, who had been saved by her earlier.

Prof. Gill sends Black Spiny Anteater and his daughter, Tiny Spiny, to retrieve some sensitive microfilm from a widow of a victim of DARK.

Dr. Komyoji is attacked by a flock of robot crows as he works in a field. Jiro tries to help him, but is thwarted by Black Crow.

Blue Stag Beetle robs bank after bank in an effort to raise funds for the development of DARK's greatest Destructoid.

Jiro manages to save a little girl from Starfish Purple. Meanwhile, DARK forces Dr. Komyoji to create the evil warrior, Hakaider.

Jiro escapes from prison but is attacked by Hakaider. Jiro is overpowered, but Hakaider is unable to destroy him.

Angler Brown has plans to brainwash children and turn them into warriors. Kikaider saves the kids but slips away quickly to avoid the police.

Grasshopper Gray builds an antenna that amplifies sound 3000 times. Masaru saves a young boy who is being attacked by Grasshopper Gray.

Mitsuko and Masaru are lured to the DARK base. Jiro stops them and proceeds alone, but he's bushwacked by Red Mine Toad. He changes into Kikaider, but gets blown to pieces.

Hanpei brings Kikaider to Mitsuko in pieces. Hakaider destroys Red Mine Toad who had downed his arch rival Kikaider. Then, Hakaida is defeated by Skeleton Flying Squirrel.

Mitsuko succeeds in surgically returning the brain in Hakaida's head to her father, but Dr. Komyoji doesn't regain conciousness until...