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Silas X. Cragg was a scientist and former World War II foe of Captain America who had developed a formula similar to the super soldier serum that had created Captain America. He chose a bitter, lonely man off the streets to try out his serum, creating the Man-Brute. He was killed by his own creation, after the Man-Brute's son had interfered in his fight with Captain America.[1]



Professor Silas X Cragg is similar to Doctor Klutch and Doctor Colosso who tried to create their own "Super-Soldier Serum".

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