The film is a re-edited Italian-language dubbed version of Godzilla featuring 80 minutes of footage from the original Godzilla (1954) and the US version Godzilla: King of the Monsters! (1956) plus 25 minutes of WWII newsreel footage and clips from other monster 1950's movies. The re-edited film was then colorized via a process called Spectorama 70 consisting of applying various colored gels to the black and white footage. The film also features a new music score composed by musician Vince Tempera (under the pseudonym Magnetic System).
Toho disliked this version of the film, considering it an "abomination". They even went as far as having references to it removed from the audio commentary for the Criterion DVD and Blu-ray releases of Godzilla (1954).
A prog rock theme, liberally adapted from the "Prayer for Peace" from the original film, was composed by musicians Vince Tempera, Franco Bixio and Fabio Frizzi (performing as Magnetic System) for the newly created opening titles and closing credits. The song, simply titled "Godzilla" was later rearranged as the themes for both Zombie (1979) and City of the Living Dead (1980).
The film soundtrack was mixed in Futursound, an 8-track magnetic sound system based on Sensurround.
In the Italian cut of the movie they used real Hiroshima footage.