Protocide (full name: Clinton McIntyre) is a villain of the Marvel universe, and an enemy of Captain America. He is a soldier who murdered his commanding officer and was given a reprieve from punishment if he acted as a guinea pig for Dr. Abraham Erskine's super-soldier serum. Eventually Steve Rogers was chosen, but before Rogers entered the seen, General Maxfeild Saunders, who had brought Clinton in as a test subject, gave him an incomplete serum, causing Clinton to go berserk and die of a heart attack.