I grew up watching this stuff as a Saturday afternoon matinee 30 years ago & now, it's still as much fun to watch.
Hercules, now married to Ioli, is returning to Thebes to help sort out a dispute over who has the rights to the throne of Thebes. Along the way, Hercules loses his memory & is seduced by the evil Amphale who goes through husbands like Elizabeth Taylor, however, Amphale is something of a black widow & uses a few Egyptians to preserve her ex-husbands in the family crypt.
However, one look at the rugged carved from granite Steve Reeves & all her black widow tendencies fly out the window, but she still wants him for good.
Of course it all ends up in a good ruckus with sword fights, chariot duels, Hercules throwing tables & coffins at rushing troops, 2 insane brothers with a hatred for each other (& their father) & inevitably the faithful sidekick who chimes in with a few vital day-saving moments.
Clint Eastwood may have been the king of the Spaghetti Western, but Steve Reeves was the king of the Spaghetti Swords & Sandals. So if that's your cup of tea, I recommend this movie as an excellent addition to your collection.