My personal favorite is Viper (Madame Hydra) but I would never say she's the greatest villain just because she's cool. My opinion of some of the greats are: Thanos, Apocalypse, Dr. Doom, Galactus, Red Skull, Molecule Man, Carnage, Ultron, Loki, Abomination, Mr. Sinister, Super Skrull, Magneto, Mephisto, Nimrod, Frightful Four, Annihilus, Psycho-Man, And the Purple Man should be a possibility because of his awesome powers but he gets defeated too much
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