An escaped convict finds himself under the control of a megalomaniacal criminal who is trying to use a scientist's experiments with invisibility for his own purposes. He has the convict rendered invisible so he can steal radioactive materials for him.
You know, if I were a megalomaniacal criminal intent on using invisibility to take over the world, I wouldn't render an ex-convict hostile to me invisible to steal material for me; I'd most likely turn invisible myself. Of course, maybe that's why I'm not a criminal mastermind; what do I know about such things? This was one of Edgar G. Ulmer's last directorial efforts, and there's very little to recommend here; it's dull and implausible, the special effects are nothing special, and it's all rather uninspired and stodgy. Perhaps "amazing" isn't the best word for this one.