Action Comics #310
Secret of Kryptonite Six! (Superman) -- 2. Give and Take (Mr. Craig fixes discarded and broken toys for charity) -- 3. Supergirl's Rival Parents! (What happens when Supergirl's Kryptonian parents are brought to Earth? Will the two sets of parents have a spank-off?) Cover: Note the green, gold, red, white, and blue kryptonite nuggets are all imitation. What happens to Superman when Jimmy takes his picture with jewel kryptonite inside? And what do those phantom zone prisoners have to do about it?
Key Facts
- Debut of Jewel Kryptonite
- Enhances the mental abilities of criminals trapped inside the Phantom Zone to affect events throughout the universe
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