King Fury was an ordinary man until he convinced his friend Dr. John Tone to test his newly invented "strength tube" on him. The resulting bombardment of "strength rays" caused King's skin to turn a "Bronze-like color" and endow him with superhuman strength. King then offered his services to the various Allied Governments and used his newfound power to thwart several Axis plots (including a hidden Japanese air base targeting the Alaskan Highway and the construction of a Nazi robot army using designs stolen from Dr. Tone).