Burly Hercules and his young blond ward Hylas are enjoying a relaxing swim on the shore of Photia Island when a contingent of battered and tattered men from the town of Phallogos beg for help. Cat-human mutants—full grown men with cat faces and furry bodies—have been ransacking the town at night and hiding in the hills in the daytime. No one knows where they came from, though guards Stephanus and Gordano reported seeing a bright light in the sky the night before the first attack. Those who have tried to stop or capture them wind up hypnotized into immobility by the swishing of the Cat-Men's tails. Even worse, Queen Newmara has apparently fallen in love with one of the Cat-Men, Felixus, and is rumored to be planning to let the city be overrun by the mutants. Hercules and Hylas accompany the men back to the city where Hylas is immediately kidnapped by the Cat-Men and held for ransom in the hills. Queen Newmara takes Hercules' mind off of rescuing Hylas by mixing him cocktails made with the Gin of Forgetfulness and making out with him in the daytime even as she hides the hairy, lithe Felixus as her midnight lover, leaving poor King Reg lots of time for his hobby, astronomy. But it is Reg who discovers strange flashes of light coming from the planet Mercury, apparently in communication with Earth. Could the Cat-Men have arrived from Mercury as a pre-invasion force? And can Hercules pry himself from the charms of Newmara to save both Hylas and the city?
This may be the first science fiction peplum movie (but not the last, with HERCULES AGAINST THE MOON MEN coming two years later), though some argue that 1956’s FIRE MAIDENS FROM OUTER SPACE was more peplum than sci-fi. The planet Mercury wasn't officially recognized until the 1500s, but it's called by that name here—of course, when have muscleman movies ever been sticklers for facts? If you take away the element of alien invaders, this is a run-of-the-mill sword and sandal movie: oiled, muscled men in togas; evil queens in flowing robes, a populace in trouble. One difference: the shiny silver spaceship, hidden in the hills, in which Hylas is held captive. Mark Forest is an impressively muscled Hercules; Angelo Zanolli, with his hair dyed silver blond, is a cute but broody Hylas. In myth, Hercules and Hylas were lovers, though that is mostly covered up here, except for the hints we get from the way Herc melts when Hylas bats his baby blues at him. And, of course, there's the final scene: with Queen Newmara packed away in the silver spaceship which Hercules flings back into the heavens, Herc picks up Hylas and takes him to the royal bedroom where, as far as we know, Felixus is still present and waiting for company. Cassandra Cassamassima, in her only screen credit, is appropriately buxom and flirty as the queen. Pictured are Zanolli and Forest. This is getting a special April 1st airing on TCM so catch it while you can.