Clark and Jimmy have rescued a world famous scientist, Dr Browning, from his dungeon. The scientist tells how more ships carry others like him to slave away in Dr Deutsch’s mines. Clark slips away, and as Superman he goes to investigate the ships entering the harbor. Can he rescue the cargo of prisoners from their fate?
Clark and Jimmy continue to search for Dr Deutsch. Elsewhere, Dr Deutsch is unaware of Jimmy and Clark’s escape, and is upset to learn his latest shipment of slaves to work his radium mine has gotten away. If he learns of the escape of our heros, what drastic measure might the evil doctor take?