Comic Title: Justice League of America #31
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: November 1964
On Sale Date: September 10, 1964 Newsstand Date September 10, 1964
Source: House Ad, 80 Page Giant #4, Page 14

Copyright Date September 10, 1964
Source: Library of Congress, Periodicals 1964

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

Title: "Riddle of the Runaway Room"
Pages: 24

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 #67 (1968)
Justice League of America Archives Vol. 5 HC (1999)
Showcase Presents:Justice League of America Vol. 2 TPB (2007)
Justice League of America:The Silver Age Omnibus Vol. 2 HC (2016)
Justice League of America:The Silver Age Vol. 4 TPB (2018)

Feature Character(s)

• Justice League of America (last appearance in Justice League of America #30; next appearance in Aquaman #18)
• Superman (last appearance in Superman's Pal, Jimmy Olsen #80; next appearance in World's Finest Comics #145)
• Batman (last appearance in Batman #167; next appearance in World's Finest Comics #145)
• Flash (last appearance in Flash #148; next appearance in Brave and the Bold #56)
• Wonder Woman (last appearance in Wonder Woman #149; next appearance in Aquaman #18)
• Green Lantern (last appearance in Green Lantern #32; next appearance in Green Lantern #33)
• Aquaman (last appearance in Aquaman #17; next appearance in Aquaman #18)
• Green Arrow (last appearance in Teen Titans #53; next appearance in Aquaman #18)
• Martian Manhunter (last appearance in House of Mystery #146; next appearance in Brave and the Bold #56)
• Atom (last appearance in Atom #15; next appearance in Aquaman #18)
• Hawkman (joins the JLA in this story; last appearance in Hawkman #4; next appearance in Brave and the Bold #56)

Supporting Character(s)

• Snapper Carr (last appearance in Justice League of America #29; next appearance in Justice League of America #33)

Villain(s)

• Joe Parry (next appearance in Justice League of America #201)
• Parry's accomplices (no further appearances)
• The Panacomputer (an alien machine with computer intelligence; no further appearances)
• Super-Duper (a composite being composed of part Wonder Woman, Flash, Batman, Hawkman, and Green Lantern; next appearance in Justice League of America #65)

Guest Appearance(s)

• Hawkgirl (last appearance in Hawkman #4; next appearance in Brave and the Bold #56)

Other Character(s)

• A group of orphans (no further appearances)
• Policemen and other inhabitants of Shore City (no further appearances)

Comments:
The Justice League attends the wedding of Aquaman and Mera in Aquaman #18 following this story.

Synopsis:
Hawkman becomes the newest member of the Justice League, and immediately teams with Batman, Flash, Green Lantern, and Wonder Woman to stop robbers using fantastic hoops which protect them by propelling whatever threatens them into the near future.

After Hawkman solves the problem of capturing the crooks, the JLA returns to their meeting room to examine the strange hoops, only to find themselves and the Secret Sanctuary suddenly propelled into outer space. Responsible for these occurrences is Joe Parry, a crook who has accidentally come into possession of an alien machine, which has created both the time-hoops and the threat to the League. Hawkman's anti-gravity powers save his fellow members from perishing in space, and the team tracks Parry to his hideout.

Parry then uses the alien device to form a super-being which is a composite of the five JLA members, possessing Flash's legs, Green Lantern's arms and ring, Wonder Woman's head and lasso, Batman's torso, and Hawkman's wings. With its combined powers, the creature defeats the heroes, whom the villain then has hurled back into space, but he has made one error -- since, the composite being, like all creations of his machine, is composed of a yellow force, its power ring cannot function. Hawkman takes advantage of this to turn the tables on both the multi-powered foe and its creator. When the machine runs out of power, all its creations vanish.