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

Issue Details

Issue #20
Published June 1963
Cover Price 0.12 USD
Pages 36
Editing Julius Schwartz

Cover Details - "The Mystery of Spaceman X"

Characters Green Lantern [Hal Jordan]; Green Arrow [Oliver Queen]; Wonder Woman; The Flash [Barry Allen]; Martian Manhunter [John Jones; J'onn J'onzz]; Aquaman; Spaceman X
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) #3; in Showcase Presents: Justice League of America (DC, 2005 series) #2

25 page Justice League of America story "The Mystery of Spaceman X!"

Characters Aquaman, The Atom [Ray Palmer]; Batman; The Flash [Barry Allen]; Green Arrow [Oliver Queen]; Green Lantern [Hal Jordan]; Martian Manhunter [John Jones; J'onn J'onzz]; Snapper Carr; Wonder Woman; Superman; Spaceman X (villain)
Synopsis An alien uses a giant spaceman to absorb disaster-energy to make himself invulnerable, but Superman separates the alien from his power source.
Genre superhero
Script Gardner Fox
Pencils Mike Sekowsky
Inks Bernard Sachs
Letters Gaspar Saladino
Notes Lettering credit from reprint in JLA Archives.
Reprinted in Justice League of America Archives, The (DC, 1992 series) #3; in Showcase Presents: Justice League of America (DC, 2005 series) #2