Iron Man: Armored Adventures/Nightmare Fuel


 * Rhona tried to gas Whitney, cut Rhodey in half, vaporize Pepper and electrocute Happy.
 * And she did something similar once before, so she probably has quite the bodycount behind her.
 * Mallen, once he takes the Extremis formula. The creepy cocoon he comes out of, his black eyes with red irises, his decomposed skin, the growing insanity, not to mention his enhanced strength, super-speed, and lightning and heat powers, make him one of Iron Man's most terrifying foes.
 * "Cooooooonsuuuuuuuume...!"
 * MODOC itself is pretty scary. It's a technilogically advanced Humpty Dumpty that, to put it simply, Mind Rapes you and steals everything in your head.