The Three Supermen — George (Jorge Martin), Sal (Sal Borgese) and Brad (Frank Braña) — accidentally use Prof. Aristide Panzarotti’s (Luigi Bonos) time machine and find themselves in the American West.
Directed, produced and co-written with Anthony Blod and Martin by Italo Martinenghi (who made the Cüneyt Arkin-starring Three Supermen Against the Godfather and that movie’s sequels Three Supermen at the Olympic Games and Three Supermen in Santo Domingo; he also produced The Three Fantastic Supermen and 1970’s Supermen), this starts with a time travel to see the dinosaurs and Pompeii erupt which has to be footage taken from other movies.
Working for the FBI, the Supermen have been tasked with taking the time machine for the U.S. government. Of course, they screw up and end up using it to take them through time, finally ending up in the west where they decide to stay after meeting Agata (Ágata Lys, Sexy… amor y fantasía).
The time machine also shows up in Three Supermen Against the Godfather.