A supervillain or criminal mastermind is a variant of the villainous stock character that is commonly found in American comic books, usually possessing superhuman abilities. A supervillain is the antithesis of a superhero.
Supervillains are often used as foils to present a daunting challenge to a superhero. In instances where the supervillain does not have superhuman, mystical, or alien powers, the supervillain may possess a genius intellect or a skill set that allows them to draft complex schemes or commit crimes in a way normal humans cannot. Other traits may include megalomania and possession of considerable resources to further their aims. Many supervillains share some typical characteristics of real world dictators, gangsters, and terrorists, with aspirations of world domination or universal leadership.
The Joker, Lex Luthor, Green Goblin, Loki, Thanos, Brainiac, Magneto, Doctor Doom, Doctor Octopus, Darkseid, Venom, Ra's al Ghul and the Riddler are some notable male comic book supervillains and have been adapted to film and television. Some notable examples of female supervillains are the Catwoman, Mystique, Harley Quinn, Talia al Ghul, Poison Ivy, Hela and Dark Phoenix.
Just like superheroes, supervillains are sometimes members of supervillain groups, such as the Sinister Six, the Suicide Squad, the Brotherhood of Mutants, the Injustice League, the Legion of Doom, and the Masters of Evil.
In the documentary "A Study in Sherlock" Stephen Moffat and Mark Gatiss have claimed to regard James Moriarty as a supervillain because he too possesses genius level intelligence and powers of observation and deduction setting him above ordinary people to the point where only he can pose a credible threat to Sherlock Holmes.
The James Bond arch-villain Ernst Stavro Blofeld have become influential to the supervillain tropes in popular cinema, including parodies like Dr. Claw and his pet M.A.D. Cat from the Inspector Gadget animated series and especially Dr. Evil and his cat Mr. Bigglesworth from the Austin Powers film series.