More or less "Reg Park's Greatest Herc Hits", since huge chunks of this film are lifted lock, stock and barrel from HERCULES IN THE HAUNTED WORLD and HERCULES AND THE CAPTIVE WOMEN (both 1961). A wraparound story is concocted about Hercules questing for his missing son Xanthus, who is imprisoned in the supernatural domain of Gia the earth goddess. Meanwhile, Gia's evil son Antaeus — himself a demigod — impersonates Hercules and takes over the city-state of Syracuse with the help of its ambitious queen. Ruling as a mad, barbarous tyrant, Antaeus (Giovanni Cianfriglia) starts exiling and slaughtering people at whim, generally soiling the name of Hercules something fierce. Naturally, the real Herc takes umbrage at this...If you've already seen HAUNTED WORLD and/or CAPTIVE WOMEN then there's really no point in watching this one. All of AVENGER's monster action and FX scenes are borrowed from those films, only with different dialog dubbed in. Its main cheesy pleasure is Gianfriglia's Antaeus. A schoolyard bully in a he-man's body, he's such a cruel, arrogant jerk that you keep watching for the moment when Herc finally kicks his butt. He's at least good for a few laughs, as when barking commands such as, "Drive them into the Valley of Agony... and block the way out!"

Hercules' son gets severely wounded during a lion hunt that goes awry. Hercules (a solid and engaging performance by the beefy Reg Park) has to venture into an eerie and dangerous alternate dimension ruled by the evil and vengeful Gia the Earth Goddess (a deliciously wicked portrayal by Gia Sandri) and battle various monsters in order to save his son's soul. Meanwhile, Gia's equally nasty son Antaius (a perfectly hateful turn by Giovanni Cianfriglia) poses as Hercules and takes over an entire city as a cruel and ruthless tyrant. Director Maurizo Lucidi relates the engrossing story at a steady pace and maintains a serious tone throughout. This film begins a little slow, but really starts cooking once Hercules enters the misty and perilous subterranean spirit world: Rousing highlights include Hercules grappling with a humanoid lizard beast, Hercules climbing a giant gnarled tree, and Hercules being attacked by a bunch of creepy rotting zombies. Better still, the bizarre spirit world just reeks of spooky atmosphere (gotta love that persistent thick swirling fog!). The strenuous rough'n'tumble mano-a-mano major physical confrontation between Hercules and Antaius likewise totally rocks. Of course, we also get a big mondo destructo climactic volcanic eruption as well. Allvaro Mancori's crisp widescreen cinematography gives the movie an impressively expansive sense of scope. Ugo Filippini's robust, rousing score has a nifty majestic sweep to it. Okay, so this flick is an obvious cheapo cute'n'paste job that uses copious footage from both "Hercules in the Haunted World" and "Hercules and the Captive Women," but it's still an extremely lively and entertaining romp all the same.

MILD SPOILERS.The other reviewer remarked that this film copies Hercules and the Huanted World. I can see where he got that impression because ten minutes of this movie was lifted from Hercules And The Haunted World. I believe that the fight with the giant rubber Iguanna came from Hercules and the Captive Women and the Volcano scene looks very familiar as well.That aside this entry in the beefcake sweepstakes is fairly is easy to take largely to do to Reg parks charisma and the smarminess of the chief villain who impersonates our hero and gives him a bad name.The Oracle is a hottie but the rest of the female cast is not as spicy or saucy as the toga babes of past efforts.Not bad if you're bored.

Hercules (Reg Park) sets out on a quest to save his son's soul from the evil Earth Goddess Gia. He must battle all sorts of monsters, get past numerous obstacles, and resist temptations if he is to save his son. What Hercules doesn't know is that while he is away, Gia sends Antaius (her rotten son) to impersonate Hercules. Antaius reigns over the people as a cruel, heartless king. Can Hercules get back in time to save the people? It's not that Hercules the Avenger is a bad movie, it's just not very original. If you've seen Mario Bava's Hercules in the Haunted World (a much superior movie), then you've seen some of the best this movie has to offer. The similarities go beyond the obvious - Reg Park, a daunting quest, ocean voyages. etc. The similarities extend to actual set pieces. For example, in both films Hercules must traverse a rope over a boiling pit of lava. Another example, in both films Hercules must do battle with flying zombie type creatures. In addition, Lucidi copies some of Bava's style. The underground scenes in this movie are lit with the same colored gels used by Bava. The things taken from Hercules in the Haunted World were so obvious, I half expected to see Christopher Lee waiting for Hercules at the end of his journey.According to IMDb, this was the last time Reg Park would play Hercules. Other than Steve Reeves, I think he was the best actor/body builder to play the role. But after taking one look at Park in Hercules the Avenger, I'm glad he gave it up. He looks terrible. By 1965, he was no longer the chiseled specimen as featured on the DVD cover. Instead, he looks more likely to be playing Bluto than Hercules.With everything I've written being so negative, I'll finish by saying you could do far worse than Hercules the Avenger. The new Region 1 DVD (with Hercules and the Black Pirate a bonus) is probably as good as this movie ever looked.