The series was produced by Nippon Gendai and Senkosha (now Senko Planning), and aired on Tokyo Broadcasting System from October 8, 1972, to April 8, 1973, with a total of 26 episodes.

Each armored ninja-like member of the clan controls a gigantic robot warrior in order to overthrow the "Yamato Government," as they call it.

In response to this terrorist threat, Japan's National Security Organization send agent Gentaro Shizuka (Shoji Ishibashi), disguised as what can best described as a Spaghetti Western version of a singing cowboy, to stop their plans with the assistance of comical, mountaineering-clad Goro Kirishima (Mitsuo Hamada).

Strangely, although Gentaro knows Iron King's time limit comes from exhausting his water supply he never manages to connect it with Goro's omnipresent thirst until the final episode.

And from the nineteenth episode to the end of the series, Gentaro and Goro battle black cloak and Puritan hat-clad white-masked aliens called Titanians, who despite looking human, have various inhuman powers such as flight, body-possessing mind control, and the ability to enlarge themselves to giant size.