Heltene i det cryptozoologiske agentur Monarch står over for historiens største monstre, hvor Godzilla konfronterer giganterne Mothra, Rodan og den trehovedede King Ghidora. Menneskehedens eksistens står på spil, når vi genser de forhistoriske superarter, som alle troede, var myter.
Tusind dage er gået, siden Godzilla forsvandt i dybet. Tokyos indbyggere frygter stadig monstrets tilbagevenden, men i stedet kommer der andre uventede gæster fra fremtiden. Videnskabsmænd ankommer i en tidsmaskine med en foruroligende desked: Om 200 år vil Godzilla vende tilbage, og denne gang vil det lykkes for ham at tilintetgøre verden! Nøglen til redning kan endnu længere tilbage i tiden, nemlig dengang da monstret blev skabt. Kan man slette Godzilla fra fremtiden, truer han ikke fremtiden længere. Men i stedet rammes verden af en anden frygtelig fare: Det trehovedede uhyre King Ghidorah!
Zone Fighter, known in Japan as Ryūsei Ningen Zone, is a tokusatsu science fiction superhero television series. Produced by Toho Company Ltd., the show aired on Nippon Television from April 2 to September 24, 1973, with a total of 26 episodes, it was cancelled due to the oil crisis of 1973. This was Toho's answer to not only the popular Ultra Series, but the Henshin Hero phenomenon started by shows like Kamen Rider and Android Kikaider. The previous year, Toho had just made their successful first superhero show, Rainbowman. The series was also notable for its guest appearance by Toho's own Godzilla, as well as two other Toho monsters, King Ghidorah and Gigan. Supplementary materials published by Toho have confirmed Zone Fighter to be part of the Showa-era Godzilla series, taking place in between Godzilla vs. Megalon and Godzilla vs. Mechagodzilla.
