Batman: The Ultimate Evil themes concerning child sexual abuse and explored the topic of child sex tourism. The publisher required Vachss to follow certain rules, like making a clear distinction between fiction and reality and prohibiting the Batman character from killing, cursing, or having sex. In the story, billionaire Bruce Wayne, who as a child witnessed the murder of his parents Thomas and Martha, encounters the social worker Debra Kane, who takes Wayne to check up on her clients: he sees clear cases of child abuse and brave but futile resistance to it. Wayne's loyal butler, Alfred Pennyworth, gives him the secret files from
Batman Versus Predator suspects that they are cold-blooded and vulnerable to frigid temperature. The plan works, but only lures one of the two aliens. Responding to Batman's confusion, and using Tim Drake's voice, the Predator indicates that it is now tracking Robin at a drive-in theater with friends, where he is watching old science-fiction films. Batman then ensnares the elder Predator with Mr. Freeze's absolute zero cannon. Alfred contacts Robin, who immediately accepts the truth and returns to the Batcave when he sees the creature's silhouette. The butler explains what little they know of their assailants before they are attacked. The two are