Zarkon - Lord of the Unknown Books in Order

A string of unexplained deaths strikes wealthy, influential people, leaving investigators without a discernible weapon or method. Prince Zarkon and his Omega Crew confront a mysterious extortionist whose demands turn an apparently invisible threat into a public terror.

Sent backward from the future to prevent evil from conquering humanity, Zarkon assembles the Omega Men using his princely fortune. Their first struggle pits them against Lucifer and the sinister organization calling itself the Brotherhood of Lemuria.

A fiery monster terrorizes Rangatoa, a South Pacific atoll, emerging from its active volcano to spread destruction. Prince Zarkon and the Omega Crew investigate the legend, facing a descent into the volcanic depths to uncover its source.

Dr. Zandor Sinestro returns to threaten Knickerbocker City's banks with manufactured earthquakes, demanding millions in ransom. Prince Zarkon and his Omega team investigate, aided by Phoenicia Mulligan and a young newsboy, while a hidden fault makes the danger real.

London police are baffled by criminals surrounded in blue auras that resist bullets and gas. Prince Zarkon and his Omega Crew investigate the seemingly unstoppable thieves, seeking the source of their protection before further attacks overwhelm the city.