In a remote mountain laboratory, timid scientist Tom Standish is assisting Dr. Wolfe's experiments in creating a serum that can mimic the strength and buoyancy of an eagle. While trying to put a successful batch of serum in storage, Standish accidentally drops the formula and it spills onto a cathode-tube, causing it to glow with a strange light. Curious as to how the tube has been changed, Standish inserts the tube into a projector and his body is instantly bombarded with black light. Tom goes to tell Dr. Wolfe what happened, but walks in on Dr. Wolfe conspiring with fellow Nazis to poison America's water supply. Tom is assaulted and thrown off a cliff. To Tom's surprise, not only does he survive the fall without a scratch, he discovers that he now has incredible strength and can easily l