The Most Dangerous Earth Of All! With the Justice League of America of Earth-One defeated by the Crime Syndicate of America of Earth-Three, the latter decides to choose Earth-Two as the final battle ground between both Earths, however they have targeted the only opposition on that Earth: The Justice Society of America. However, before the CSA can arrive, the JLA are able to warn the JSA about the CSA's previous victory from saying the word "Volthoom".
Hawkman battles Johnny Quick, Black Canary battles Super Woman, Dr. Fate battles Power Ring, Hour Man battles Owl Man, and Star Man battles Ultra Man. In each battle, the JSA members manage to defeat the CSA members, however this was anticipated and this time "Power Ring" sets his ring to transport the JSA members to Earth-Three should they manage to defeat them.
Transporting the JLA members to Earth-Two for their final combat against the CSA, each JLA member is forced to fight a CSA member. Superman battling Ultra Man, Green Lantern fighting Power Ring, Wonder Woman fighting Super Woman, Flash against Johnny Quick and Batman fighting Owl Man. Each JLA member manages to defeat their CSA counterpart. And upon victory the JLA banishes the CSA in a bubble between worlds and frees the JSA from imprisonment. With the CSA defeated, both teams return to their respective Earths.
