- Gardner Fox
- Mike Sekowsky
- Bernard Sachs
- Gaspar Saladino
- Justice Society of America [Hawkman [Carter Hall]; Black Canary [Dinah Drake Lance]; Dr. Fate [Kent Nelson; Nabu]; Dr. Mid-Nite [Charles McNider]; Starman [Ted Knight]; The Flash [Jay Garrick]; Atom [Al Pratt]; Green Lantern [Alan Scott] (all Earth-2)]; Crime Syndicate of America [Power Ring; Johnny Quick; Owlman; Superwoman; Ultraman (all Earth-3)(introduction)]; Justice League of America [The Flash [Barry Allen]; Wonder Woman [Diana Prince]]; Superman [Clark Kent; Kal-El]; Batman; Green Lantern [Hal Jordan]; Aquaman; Martian Manhunter [J'onn J'onzz]; Snapper Carr (mascot) (all Earth-1)]; Christopher Columbus (Earth-3; cameo); Abraham Lincoln (Earth-3; cameo); President John Wilkes Booth (Earth-3; cameo); George Washington (Earth-3; cameo); General Cornwallis (Earth-3; cameo)
- 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.
- Earth-3; Green Kryptonite
Lettering credit from reprint in JLA Archives. Story continues in next issue.
Story is told in three chapters, each ending in 2/3 page.
Brief history of Earth-3 also given in this issue, where history ran a reverse course (e.g.- Columbus, an American discovers England and Europe; The English win their war of independence from America; John Wilkes Booth is U.S. President and assassinated by actor Abraham Lincoln), hence why super-powered persons are evil on this earth. Earth-3 also named this issue, and introduction of Crime Syndicate (first appearances).