DC Comics Presents #84
At the Daily Planet, the Challengers of the Unknown seek help to contact Superman to help them solve the mystery of a card with a Kryptonian letter. Superman uses his mind-prober ray to recall Zo-Mar, a Kryptonian criminal shot into space before the discovery of the Phantom Zone, and his mind-slaving card. Superman and the Challs find Zo-Mar, but he enslaves them all with his card. The card, however, inhibits Kryptonian super-powers, and when Superman and the Challs trick Zo-Mar into grabbing the card, they make him weak enough that Superman can knock him out and send him to the Phantom Zone.
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At the Daily Planet, the Challengers of the Unknown seek help to contact Superman to help them solve the mystery of a card with a Kryptonian letter. Superman uses his mind-prober ray to recall Zo-Mar, a Kryptonian criminal shot into space before the discovery of the Phantom Zone, and his mind-slaving card. Superman and the Challs find Zo-Mar, but he enslaves them all with his card. The card, however, inhibits Kryptonian super-powers, and when Superman and the Challs trick Zo-Mar into grabbing the card, they make him weak enough that Superman can knock him out and send him to the Phantom Zone.
Plot details indexed by the Grand Comics Database (CC BY-SA).