Data courtesy of the Grand Comics Database under Creative Commons license.

Issue Details

Issue #30
Published September 1964
Frequency eight times a year
Cover Price 0.12
Pages 36
Editing Julius Schwartz
Notes Lettering credit from reprint in JLA Archives.

Cover Details - "The Most Dangerous Earth of All!"

Characters Green Lantern [Hal Jordan]; Batman [Earth-1]; The Flash [Barry Allen] (all as the Justice League of America/JLA); Power Ring; Owlman; Johnny Quick [Earth-3] (all as the Crime Syndicate)
Genre superhero
Pencils Mike Sekowsky
Inks Murphy Anderson
Letters Ira Schnapp
Notes Lettering credit from reprint in JLA Archives.
Reprinted in Justice League of America Archives, The (DC, 1992 series) #4; in Crisis on Multiple Earths (DC, 2002 series) #nn [1]; in Showcase Presents: Justice League of America (DC, 2005 series) #2

24 page Justice League of America story "The Most Dangerous Earth of All"

Characters 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)]; 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)]
Synopsis The JSA is tricked into being transported to an interdimensional prison by the Crime Syndicate (using the same word 'Volthoom' that captured the JLA last issue), so the JLA must battle the Crime Syndicate on Earth-2. The JLA then gets the Syndicate to over-exert themselves, imprisons them between the dimensions, and later frees the JSA from their dimensional trap set by the Syndicate to destroy the earths should they have lost vs. both teams.
Genre superhero
Script Gardner Fox
Pencils Mike Sekowsky
Inks Bernard Sachs
Letters Milton Snapinn
Notes Lettering credit from reprint in JLA Archives. Story concludes from previous issue.
Reprinted in Justice League of America (DC, 1960 series) #114 (November-December 1974); in Justice League of America Archives, The (DC, 1992 series) #4; in Crisis on Multiple Earths (DC, 2002 series) #nn [1]; in Showcase Presents: Justice League of America (DC, 2005 series) #2