Unofficial Justice League of America Index

JUSTICE LEAGUE OF AMERICA #20

Cover Date: June 1963
Cover Price: $0.12
Publication Date: 1963-04-25

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Cover Credits:
Art: Murphy Anderson

Story: "The Mystery of Spaceman X!" (24 Pages)

Credits:

Story	Gardner Fox
Pencils	Mike Sekowsky
Inks	Bernard Sachs
Lettering	Gaspar Saladino
Editing	Julius Schwartz

Feature Character(s):

Justice League of America

Aquaman (last in World's Finest Comics #133/2; next in Aquaman Vol. 1 #10)

Atom (Ray Palmer; next in Atom #7)

Batman (last in Batman Vol. 1 #156/2; next in Detective Comics #316)

Flash (Barry Allen; between Flash Vol. 1 #137 and #138)

Green Arrow (in between World's Finest Comics #134/2 and #136/2)

Green Lantern (Hal Jordan; between Green Lantern Vol. 2 #21/2 and #22)

Martian Manhunter (in between Detective Comics #316/2 and #317/2)

Superman (last in Superman's Pal Jimmy Olsen #69/2; next in Action Comics #301)

Wonder Woman (next in Wonder Woman Vol. 1 #139)

Supporting Character(s):

Snapper Carr (next in issue #23)

Villain(s):

Pallkan (first mentioned, never seen; would-be interstellar conqueror and ruler of the outermost planet in the Mizar system)

an unidentified alien (first appearance; disguised as a spaceship for most of the story)

Spaceman X (an giant alien robot; first appearance)

Other Character(s):

Inhabitants of Allamar (an alien race; first appearance)

Insect-People of Ulisson (an alien race; first appearance)

Plant-People of Zomarr (an alien race; first appearance)

Location(s):

Space Sector 2814

Sol star system

Earth

United States of America

Happy Harbor

Secret Sanctuary

Harbor City (first appearance)

Unidentified Space Sector(s)

Mizar star system (82.84 light years from Earth)

Allamar (first appearance)

Allamar City (first appearance)

Ulisson (first appearance)

Zomarr (first appearance)

the outermost planet in the Mizar system (mentioned only)

Story Reprinted in:

Justice League of America Archives #3 (November 1994)

Showcase Presents: Justice League of America #2 ([March] 2007)

Justice League of America Omnibus #1 (March 2014) or ([June] 2014)

Justice League of America: The Silver Age #3 ([June] 2017)

Justice League of America: The Silver Age Omnibus #1 ([October] 2020)

Solicitation:

An alien uses a giant spaceman to absorb disaster-energy in order to make himself invulnerable!

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