Billy is on vacation at Rimrock and gets involved, as Captain Marvel, in a broncho riding contest. But Billy spots the owner of the Crossbone Ranch and feels he knows him, and begins an investigation that leads him directly to the owner as the leader of a large rustling operation while he poses as a victim himself of the band of rustlers.; Billy is given an assignment to interview a Doctor Deever, who has created a process to restore the dead to life. The doctor takes Billy to a cemetery and succeeds in raising a vampire back to life, losing his own in the process. Captain Marvel must figure out a way to defeat his unholy foe before more people become its' victims, and, as Billy, checks out a book to aid him in his cause: "The Vampire Legend" by H. P. Lovecraft.; Thwarted time and time again by his avowed enemy, Captain Marvel, Sivana decides to create a rival that is more than human to combat his hated foe... a foe he calls "Z", because he is the ultimate in toughness.; Billy receives a message from Saturn over his radio device from captives that are being enslaved by monsters on the planet, asking for assistance. Captain Marvel travels by rocket ship to Saturn to take on the vicious slave drivers, allowing himself to be captured by his foes in order to get the full story about the enemy before he deals with them and prevent an invasion of the Earth.