In the book Superhero: The Secret Origin of a Genre, Peter Coogan writes that Doctor Doom's appearance was representative of a change in the portrayal of "mad scientists" to full-fledged villains, often with upgraded powers [REF].
Described as "iconic",[REF] Doctor Doom is one of the most well-received supervillains of the Marvel Universe, as well as one of the most recurring;[REF] in his constant battles with heroes and other villains, Doctor Doom has appeared more times than any other villain [REF].