Action Comics, Vol. 1 #398 (1971)

The Pied Piper of Steel! / Spawn of the Unknown

The Pied Piper of Steel! - Clark is assigned to cover rock concerts that have all the teens riled up. What will he do when he sees evidence of mind control at work?

Spawn of the Unknown - Superman arrives in a desert, where various non-indigineous life forms are being transformed into plants. When Superman sees a plant shaped like Supergirl, he fears the worst, dedicating his life to finding a cure.

Release Date: 1971