Comic Title: Justice League of America #75
Publisher: DC (National Periodical Publications, Inc.)
Address: 909 Third Avenue, New York, NY
Cover Date: November 1969
On Sale Date: September 11, 1969 Copyright Date September 11, 1969
Source: Library of Congress, Periodicals 1969

Newsstand Date September 11, 1969
Source: Newsdealer Magazine, V24 #7

Frequency: Monthly, (with the exception of Jan., Apr., July, and Oct. (semi-monthly, Nov.)
Cover Price: $0.15
Page Count: 32
Editor: Julius Schwartz

Title: "In Each Man There Is a Demon"
Pages: 23

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

Writer: Dennis J. O'Neil
Penciller: Dick Dillin
Inker: Joe Giella

Reprinted In:
Best of DC #31 (1982)
Justice League of America Archives Vol. 9 HC (2005)
Justice League of America Hereby Elects... TPB (2007)
Green Arrow/Black Canary:For Better or For Worse TPB (2007)
Showcase Presents:Justice League of America Vol. 4 TPB (2009)
Justice League of America:The Silver Age Omnibus Vol. 2 HC (2016)

Feature Character(s)

• Justice League of America (last appearance in Justice League of America #122; next appearance in Justice League of America #77)
• Superman (last appearance in Justice League of America #122; next appearance in Superman #221)
• Batman (last appearance in Justice League of America #122; next appearance in Detective Comics #393)
• Green Arrow (last appearance in Justice League of America #122; next appearance in Justice League of America #77)
• Atom (last appearance in Justice League of America #122; next appearance in Justice League of America #77)
• Hawkman (last appearance in Atom & Hawkman #45; next appearance in Justice League of America #78)
• Black Canary (first appearance; last appearance in Justice League of America #220; next appearance in Justice League of America #77)

Villain(s)

• The Destructors (evil duplicates of Green Arrow, Black Canary, Atom, Batman, and Hawkman; no further appearances)
• John Deleon (a crooked businessman; no further appearances)
• A pair of muggers (no further appearances)

Other Character(s)

• Dr. Oyal (a psychiatrist; no further appearances)
• An elderly couple (no further appearances)
• A Superman robot (no further appearances)

Cameo Appearance(s)

• Green Lantern (of Earth-1; in flashback)
• Green Lantern (of Earth-2; in flashback)
• Aquarius (in flashback)
• Larry Lance (in flashback)

Comments:
Only Superman and the Justice Society members know that the Black Canary who joins the Justice League is not the original heroine, but her daughter. The rest of the Justice League, and Black Canary herself, do not learn this until the events of Justice League of America #220. The true origin of her sonic powers is also revealed in that story for the first time. The powers are not, as suggested in this story, the result of Aquarius's magic, nor are they the result of Black Canary's journey between parallel Earths.

Synopsis:
Framed for misuse of public funds by John Deleon, Oliver Queen loses his fortune and his investment company, and begins to doubt his usefulness as Green Arrow. Meanwhile, as the other Justice League members vote on the admission of Black Canary as a new member, she begins to exhibit strange sonic powers over which she has limited control, supposedly, a result of her exposure to Aquarius's magic sphere.

Another side-effect of Aquarius's power then materializes the members' evil natures as separate entities, and battle ensues. By disguising one of his robots as his own evil self and defeating it, Superman encourages his fellow crusaders in their struggles with their own opposite numbers. Green Arrow's battle amounts to a direct confrontation with the self-doubt that had been plaguing him, and when he defeats his other self, he regains his confidence.