Comic Title: Justice League of America #15
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: November 1962
On Sale Date: September 13, 1962 Copyright Date September 13, 1962
Source: Library of Congress, Periodicals 1962

Frequency: Monthly, with the exception of Jan., April, July and Oct.
Cover Price: $0.12
Page Count: 32
Editor: Julius Schwartz

Title: "The Challenge of the Untouchable Aliens"
Pages: 25

Feature(s):
Justice League of America (of Earth-1)

Writer: Gardner F. Fox
Penciller: Mike Sekowsky
Inker: Bernard Sachs

Reprinted In:
Justice League of America #116 (1975)
Justice League of America Archives Vol. 3 HC (1994)
Showcase Presents:Justice League of America Vol. 1 TPB (2006)
Justice League of America Omnibus Vol. 1 HC (2014)
Justice League of America:The Silver Age Vol. 2 TPB (2017)

Feature Character(s)

• Justice League of America (last appearance in Justice League of America #14; next appearance in Justice League of America #16)
• Superman (last appearance in Action Comics #293; next appearance in Superman #157)
• Batman (last appearance in Batman #151; next appearance in Detective Comics #309)
• Flash (last appearance in Flash #132; next appearance in Flash #133)
• Wonder Woman (last appearance in Wonder Woman #133; next appearance in Wonder Woman #134)
• Green Lantern (last appearance in Green Lantern #16; next appearance in Green Lantern #17)
• Martian Manhunter (last appearance in Detective Comics #308; next appearance in Detective Comics #309)
• Aquaman (last appearance in World's Finest Comics #129; next appearance in Aquaman #6)
• Green Arrow (last appearance in World's Finest Comics #129; next appearance in World's Finest Comics #130)
• Atom (last appearance in Atom #3; next appearance in Atom #4)

Supporting Character(s)

• Snapper Carr (last appearance in Justice League of America #14; next appearance in Atom #4)

Guest Appearance(s)

• Jean Loring (last appearance in Atom #3; next appearance in Atom #4)

Other Character(s)

• A group of giant stone-men (inhabitants of a parallel Earth; no further appearances)
• Various reporters and military personnel attending a weaponry demonstration, and various office workers in the Wilmoth Building (no further appearances)

Comments:
There are no real villains in this story, as the stone giants are not actually malevolent.

Snapper Carr graduates from high school and shares an adventure with the Atom in the first story of Atom #4 following this story.

Synopsis:
Super-weapons of different nations are stolen by an invisible force, and giant stone men appear in Tokyo, Brasilia, and Central City. When the weapons are used for the attempted destruction of these cities, the Justice League members split up to investigate. The stone men prove intangible to their blows, but solid when striking in their defense. Although they prevent Tokyo from being wiped out, J’onn J’onzz, Green Arrow, and Aquaman are unable to halt their foe, until he vanishes, and the same thing happens to Superman, Wonder Woman, and the Atom in Brasilia.

In Central City, Batman, Flash, and Green Lantern learn that the stone men are inhabitants of a parallel Earth separated from Earth-1 by one minute of time. Simultaneous nuclear explosions on each Earth have caused them to approach each other, and the aliens seek to prevent the mutual destruction this would cause by obliterating those cities which share locations of cities on their world.

Green Lantern resolves the problem by causing the two worlds again to be separated by one full minute of time.