Hercules (Maciste in the original version) attempts to free the people of the kingdom of Samar from the rule of their evil queen.

She is under the spell of invading Moon Men who demand children for sacrifice in hopes their spilled blood can revive their own dead queen.

"[6] Film historian Gary Allen Smith noted: "In this combination of peplum and science fiction, this silly, but diverting, entry has the indomitable Alan Steel (real name: Sergio Ciani) fight a collection of Moon monsters before the inevitable cataclysm destroys the invaders.

This sequence involved many of the cast floundering around pointlessly in a sandstorm for upwards of five minutes of screen time, in which no plot movement or character development is made at all.

The "Deep Hurting" concept is introduced by Dr. Forrester as a follow-up to "Rock Climbing", a pain point of the movie Lost Continent that had previously been shown.