AAfter seeing that Uncle James casts no reflection in a mirror, convincing proof that he is a vampire, Doc Hull (Olive Carey) helps Billy break out of jail. Billy hurries back to the ranch but finds that both Underhill and Betty are missing. Concluding that Underhill must have taken Betty to the abandoned silver mine, Billy heads there. Meanwhile, Underhill/Dracula is putting Betty to sleep while preparing to bite her and make her his vampire bride. Billy arrives in time to fire seven bullets (from his six-shooter), but Dracula is not fazed and simply knocks Billy out cold. The Doc and Sheriff Griffin (Roy Barcroft) arrive just as Underhill zooms in on Betty for a final neck bite, and the sheriff shoots Dracula several more times but to no avail. Billy, now conscious again, grabs the sheriff's gun and tosses it at Dracula, hitting him in the head and knocking him out cold. He then takes the Doc's scalpel and hammers it into Dracula's heart. As Dracula begins to deteriorate, Betty wakes up, none the worse for the wear. In the final scene, Billy carries Betty out of the cave, stopping on the way for a long kiss, while Doc and the sheriff follow.
AThe movie was filmed from a screenplay written by American screenwriter Carl. K. Hittleman. The character of Dracula (who impersonates Uncle James Underhill in the movie) is taken from the 1897 novel Dracula by Irish author Bram Stoker. The character of Billy the Kid was taken from a real19th-century American outlaw who, according to legend, killed 21 men during his days as an outlaw, one for each year of his life, though he likely killed far fewer than that number.