In the book Superhero: The Secret Origin of a Genre, Peter Coogan writes that Doom's original appearance was representative of a change in the portrayal of "mad scientists" to full-fledged villains, often with upgraded powers. These supervillains are genre-crossing villains who exist in adventures "in a world in which the ordinary laws of nature are slightly suspended"; characters such as Professor Moriarty, Count Dracula, Auric Goldfinger, Hannibal Lecter, Joker, Lex Luthor, and Darth Vader, also fit this description. Sanderson also found traces of William Shakespeare 's characters Richard III and Iago in Doom; all of them "are descended from the 'vice' figure of medieval drama", who address the audience in monologs detailing their thoughts and ambitions.