Cover: Curt Swan & George Klein

Adventure Comics #300

Sep 1962 · DC · 0.12 USD

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“The Super-Planet of Clark Kent and Lana Lang!”

In Adventure Comics #300, a mysterious force disrupts the Legion of Super-Heroes during a routine meeting, leaving them powerless—until a shocking revelation unfolds. Written by Jerry Siegel and illustrated by John Forte and Al Plastino, this landmark issue features a dramatic twist involving a future threat tied to Lex Luthor’s schemes, all set against the iconic backdrop of the Legion’s headquarters. The cover by Curt Swan and George Klein captures the tension perfectly, making this a must-have for collectors of early DC science fiction.

writer Jerry Siegel · artist, inker John Forte · artist, inker Al Plastino · letterer Milton Snapinn · cover Curt Swan, George Klein

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FR $32 FR $33.99 GOOD $45.95 GD $49.99 GD $50 GD $55 GOOD $74.99 FN $75

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Full credits

writer Jerry Siegel

artist, inker John Forte

artist, inker Al Plastino

letterer Milton Snapinn

cover pencils Curt Swan

cover inks George Klein

Full plot ⚠ may contain spoilers

▸ Reveal full plot — may contain spoilers

At a regular meeting of the Legion of Super-Heroes, the Legionnaires lose control of their powers. Urthlo arrives and announces that he now controls the Legionnaires' powers and there is nothing they can do about it. But Saturn Girl comes up with a serum to temporarily cure Mon-El and immunize him against lead, and Superboy releases him from the Phantom Zone to knock out Urthlo, who turns out to be an automaton created by Lex Luthor sent into the future to destroy the Legion.

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