Justice League of America #29
In "Crisis on Earth-Three!", the Crime Syndicate—bored with their role as Earth-3’s supreme villains—break through to the Justice League’s world after Ultraman gains a strange new power from repeated exposure to Green Kryptonite. With the JLA momentarily on the defensive, the Syndicate teleport them to their home Earth, where they hold the upper hand. Now, with the JSA on their target list, the League must find a way to even the odds before it’s too late. Written by Gardner Fox and illustrated by Mike Sekowsky, with inks by Bernard Sachs and letters by Gaspar Saladino, this 1964 classic features cover art by Mike Sekowsky and Murphy Anderson.
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The Crime Syndicate is so bored of life on their Earth as supreme villains, designated as Earth-3, that they come to the JLA's Earth for a new challenge after Ultraman accidentally discovers it when exposed to Green Kryptonite (which gives him a new power with every exposure to it). Just as it looks like the JLA has the upper hand, the Crime Syndicate teleports them to Earth-3, where they have the advantage. To secure a level battlefield the Crime Syndicate plans to go to the Earth-2 and eliminate the JSA.
Plot details indexed by the Grand Comics Database (CC BY-SA).