During the Cold War Russia sought to create a super powered hero to rival those of America. The man now known as Furnace could compose himself completely of flame. Due to the rushed process of his creation, he became trapped in the form and slowly began to go out. In order to stay alive he was placed in the suit he wears today, giving him super-strength and durability, gives him a computer-like mind as well as allowing him to release large concussive blasts of heat energy. He is now a threat to both America and Russia, who he blames for his state, as well as anyone who tries to get in the way of his plans.
