Cover: Curt Swan & Sheldon Moldoff

Action Comics #310

Mar 1964 · DC · 0.12 USD

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“Secret of Kryptonite Six!”

In "Secret of Kryptonite Six!", Superman is drawn into a deadly gamble when Jax-Ur manipulates him into freeing him from the Phantom Zone to save Atlantis from a mysterious plague. With the help of Curt Swan’s dynamic art and George Klein’s sharp inks, this 1964 classic sees the Man of Steel confront a terrifying new threat: Jewel Kryptonite, a crystalline substance born from the Phantom Zone’s power, allowing its prisoners to project their will into reality. The cover by Curt Swan and Sheldon Moldoff captures the tension perfectly, making this a must-have for fans of early Superman adventures.

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writer Leo Dorfman · artist Curt Swan · inker George Klein · letterer Joe Letterese · cover Curt Swan, Sheldon Moldoff

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Full credits

writer Leo Dorfman

artist Curt Swan

inker George Klein

letterer Joe Letterese

cover pencils Curt Swan

cover inks Sheldon Moldoff

Full plot ⚠ may contain spoilers

▸ Reveal full plot — may contain spoilers

Jax-Ur tricks Superman into releasing him from the Phantom Zone to save the people of Atlantis from a plague. He then uses the opportunity to create Jewel Kryptonite, which allows the Phantom Zone prisoners to focus their thoughts to affect the outside world.

Plot details indexed by the Grand Comics Database (CC BY-SA).