When a trio of scientists who have discovered an alternative energy source starts dying mysteriously Bob Fleming goes to Casablanca to solve the mystery.

Rome chafes under the rule of the Emperor Domitian and his Egyptian mistress, Artamne. A mysterious champion arises to fight against the Emperor -- a masked man known as the Red Wolf. In fact, the Red Wolf is Valerius Rufus, one of the Emperor's trusted centurions who's aided by none other than the Emperor's court jester, the diminutive Elpidion. Rebels in league with Valerius kidnap Artamne, planning to exchange her for two of their imprisoned colleagues, but Artamne escapes and soon both Valerius, (now exposed as the Red Wolf), and his fiancee, Lucilla, are sentenced to be immersed in a cauldron of molten lead. Valerius's friends, however, rise up to rescue him and to liberate Rome.

Rivaling Pirates and Spanish gold are the ingredients for this story. Blackie the pirate is the one who first hears from this shipment of gold when he encounters "Don" Pedro. He thinks of a plan to find this ship and its gold. His counter player is the vice roy of the Spanish kolony. When they visit one of the pirate settlements, they find three other pirate captains over there. One of them sells goods and prisoners from his latest capture. Don Pedro recognizes the wife of the vice roy, and Blackie buys her. However, one of the pirate captains, Skull, knows also who she is, and tries to make a deal. Blackie refuses, and Skull makes a deal with the other two pirate captains to plot against Blackie.