Enemies
* Advanced Idea Mechanics or AIM is a techno-based terrorist group that splintered from its mother group, HYDRA. The group is often led by the conniving cyborg MODOK.
* Blizzard - A costumed villain with a suit that enables him to produce ice and cold.
* Blacklash - A weapons expert who brandishes a specially designed whip as his signature weapon.
* Count Nefaria - Leader of the crime cartel the Maggia
* Crimson Dynamo - A Soviet supersoldier clad in powered armor.
* Dreadknight - A disfigured scientist with a vendetta against Iron Man and Doctor Doom.
* Fin Fang Foom - Alien dragon from the planet Maklu IV.
* The Ghost - A professional saboteur who's determined to kill Tony Stark and destroy Stark Enterprises.
* Grey Gargoyle - A costumed villain who can turn anything he touches into stone.
* Immortus - A master of time itself and future version of Kang the Conqueror, Immortus was responsible for manipulating Iron Man into various acts of villainy (including murder) against the Avengers during the controversial storyline, "The Crossing".
* Iron Monger - Obadiah Stane, the business executive who stole Stark Enterprises from Tony Stark.
* Justin Hammer - A businessman and rival of Tony Stark. He often pays superpowered "baddies" to sabotage Stark Enterprises. His daughter, Justine, is the villainess the Crimson Cowl.
* Living Laser - A laser expert who eventually evolved into a being made of pure light energy.
* Madame Masque - The daughter of Count Nefaria, she hides her scarred face behind a golden mask. She often has conflicted loyalties between her father and her lover, Iron Man.
* The Mandarin - Considered by many to be Iron Man's greatest foe, the Mandarin is a Chinese nobleman, scientist and former diplomat turned criminal mastermind. His true power comes from his superhuman mastery of the martial arts and ten rings of power he recovered from an alien spaceship.
* Radioactive Man - A Chinese physicist who can manipulate radiation.
* Roxxon Oil (a corporation) - A major business rival of Stark Enterprises. They have a shady reputation and are constantly sending supervillains to sabotage Stark Enterprises.
* Spymaster - A mercenary and spy-for-hire.
* Sunset Bain - An expert and genius in the field of cybernetics, she is a seller of technological wares for super-villains.
* Titanium Man - A Soviet supersoldier clad in powered armor. Mentor to the Unicorn, who knew him as "the Other".
* The Unicorn - A Soviet supersoldier who was healed and mentored by Titanium Man. His suit is equipped with a cone-shaped blaster on his head.
* Ultimo - A Doomsday robot.
* Whirlwind - A costumed villain who can create strong whirlwinds by spinning.
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