The protagonist of the tale, Tony Stark, is a millionaire inventor and arms manufacturer who lead a seemingly charmed life, but who soon develops a problem, as did all of Marvel's best characters. While testing experimental transistor powered weapons in the jungles of Vietnam, Stark ins injured by an exploding booby trap and is captured by the enemy. Fatally injured by a pice f shrapnel that is working its way toward his heart, Stark is ordered to spend his last days inventing new armaments for the Communists; instead he constructs a suit of transistorized armor that also serves as a pacemaker to keep his heart beating. As Iron Man, he conquers his foes and manages to escape, but he is doomed to remain at least partially encased in metal until the day he dies. Life as a Marvel hero was never a bed of roses.