Synopsis
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.
Credits
- Script
- Bob Rozakis, Dick Giordano
- Pencils
- Jack Kirby
- Inks
- Greg Theakston
- Colours
- Greg Theakston
- Letters
- John Costanza
- Editor
- Julius Schwartz
- Consulting editor
- E. Nelson Bridwell
- Managing editor
- Tom Condon
- Pages 1-2, 10-24
- Jack Kirby
- Pages 3-9
- Alex Toth
Characters
Ratings
Other printings & variants
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