An amnesiac Metallo reemerges from the ocean and washes ashore on a volcanic island. Two children find him and make him their friend. As Metallo gradually remembers more of his past, he becomes evil again and seeks revenge on Superman.

Lois' stalker Edward Lytener returns as Luminus to seek revenge against Superman, with a way to depower him by tinting the sunlight red to match the red Kryptonian sun. He ties up and gags Jimmy and Lois and uses them as bait for Superman, who finally saves them.