Set in the Ice Age, a nomadic tribe of sun worshippers reach an area they decide to settle in.

The women are freed but Maciste destroys their path to the surface once they have left and is captured by the moon worshippers who bury him, and later Moah in the earth so the worms may eat their bodies.

Fire Monsters Against the Son of Hercules was a co-production between Italy's Euro International Film and Yugoslavia's Caserbib.

[1] The film was shot at Incir De Paolis Studios in Rome and on location in the caves of Ljubljana in Slovenia.

[1] In the UK it was originally released as Colossus of the Stone Age in 1964, and retitled Land of the Monsters for its 1975 re-release paired with the 1965 film Revenge of the Gladiators.