The movie is set in the near future, when the “ARK Project” has initiated a program to increase the quality of human life through the peaceful use of robots. Dr. Komyoji, the chief scientist on the project, has developed a process to create a robot with a figurative human “heart” through the installation of a “conscience circuit”, but his plans are violently opposed by researcher Gilbert Kanzaki. When Dr. Komyoji is killed in an apparent accident, his children Masaru and Mitsuko are targeted by mysterious forces within the ARK Project looking to gain control of the scientist’s research data. But the villains are opposed by Jiro, the android with a human conscience who fights for justice as the hero Kikaider.

Set in the late 1920s, The Age of Shadows follows the cat-and-mouse game that unfolds between a group of resistance fighters trying to bring in explosives from Shanghai to destroy key Japanese facilities in Seoul, and Japanese agents trying to stop them. A talented Korean-born Japanese police officer, who was previously in the independence movement himself, is thrown into a dilemma between the demands of his reality and the instinct to support a greater cause. Written by Anthony Mumford

An unknown accident occurs in Tokyo Bay's Aqua Line, which causes an emergency cabinet to assemble. All of the sudden, a giant creature immediately appears, destroying town after town with its landing reaching the capital. This mysterious giant monster is named "Godzilla".