[2] Howard Hughes described The Three Fantastic Supermen as being patterned after the film Superargo and the Faceless Giants.

[3] The director Gianfranco Parolini had worked in several genres including sword-and-sandal films where there are more than one hero helping each other achieve their goals.

Former stuntman Aldo Canti billed as "Nick Jordan" appeared in Parolini's Five for Hell and Sabata films.

[6] In a contemporary review, the Monthly Film Bulletin noted that the stunt work of the title characters and their various stunt doubles "provide a welcome relief from the standard secret agent/judo syndrome" as well as that the "ingenuity of this comic strip adventure begins to pall after the first half hour, and the inevitable final holocaust in the master criminal's lair is brightened by the villain's diverting scheme to produce an army of robot villains who all look like the hero.

"[8] From retrospective reviews, Roberto Curti described the film as a "mixed bag" taking too much material from its sources such as The Phantom, Zorro and Goldfinger.