Comic Title: Justice League of America #13
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: August 1962
On Sale Date: June 12, 1962 Newsstand Date June 12, 1962
Source: House Ad, Green Lantern #14, Page 30

Copyright Date June 12, 1962
Source: Library of Congress, Periodicals 1962

Newsstand Date June 12, 1962
Source: Newsdealer Magazine, V17 #4

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

Title: "The Riddle of the Robot Justice League"
Pages: 26

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 #93 (1971)
Justice League of America Archives Vol. 2 HC (1993)
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 #12; next appearance in Justice League of America #14)
• Superman (last appearance in World's Finest Comics #127; next appearance in Superman #155)
• Batman (last appearance in World's Finest Comics #127; next appearance in Detective Comics #306)
• Flash (last appearance in Flash #130; next appearance in Flash #131)
• Wonder Woman (last appearance in Wonder Woman #131; next appearance in Wonder Woman #132)
• Green Lantern (last appearance in Green Lantern #14; next appearance in Green Lantern #15)
• Martian Manhunter (last appearance in Detective Comics #305; next appearance in Detective Comics #306)
• Aquaman (last appearance in World's Finest Comics #127; next appearance in World's Finest Comics #128)
• Green Arrow (last appearance in World's Finest Comics #127; next appearance in World's Finest Comics #128)

Supporting Character(s)

• Snapper Carr (last appearance in Justice League of America #12; next appearance in Justice League of America #14)

Villain(s)

• Zed Brann (a scientific genius; appears in flashback only; no further appearances)
• The inhabitants of planet Skarn (no further appearances)
• Robot duplicates of all the Justice League members except Aquaman (destroyed in this story; no further appearances)
• A gang of thieves, a pair of crooks, and the Blackout Bomb Gang (no further appearances)

Guest Appearance(s)

• Speedy (last appearance in World's Finest Comics #127; next appearance in World's Finest Comics #128)
• Tom Kalmaku (last appearance in Green Lantern #14; next appearance in Green Lantern #15)
• Jimmy Olsen (last appearance in Action Comics #290; next appearance in Superman #155)

Other Character(s)

• Sforll and other inhabitants of planet Erislane (no further appearances)
• Ragnar of Ultranoor (an alien hero; dies in flashback; no further appearances)
• A crowd of spectators at a charity fair (no further appearances)

Synopsis:
In the midst of their private lives, the Justice League members are teleported through time and space to the planet Erislane, where they are enlisted in a struggle to save the entire universe. While the life-force of an alien universe dies out, the scientists of the planet Skarn steal the life-force from a neighboring universe in order to survive. Over the eons, they have done this many times, challenging the champions of the various universes they victimized to battle robot duplicates of themselves – battles which the robots have always won. Now, as the life-force of the universe containing Earth and Erislane is about to be stolen, the League is called in.

Because Skarn is a waterless world, there is no duplicate of Aquaman, so he acts as coach. Although the robots are supposedly nothing more than the exact equals of their counterparts, they prove to be the masters of the originals until Aquaman’s coaching provides the impetus needed for the League to win. Superman discovers that special transmitters in the robots convert the sound energy of the cheering Skarn crowd into power for the robots, thus insuring their victory.

When the Skarnians attempt to renege on their agreement to spare the JLA’s universe, the heroes locate their hidden life-force-stealing apparatus, and destroy it. Then they are returned to Earth mere moments after their departure.