“Dario” (played by Rory Calhoun) is an Athenian who’s taken some time out while visiting the lovely island of Rhodes. He’s known as something of a military figure, so he's welcomed warmly by the locals—though they also run a profitable slave trade with Phoenician partners. It doesn't take long for "Dario" to discover that there’s a scheme underway to overthrow “King Serse” (Roberto Camardiel), and that the massive st…