Comic Title: Justice League of America #16
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: December 1962
On Sale Date: October 30, 1962 Copyright Date October 30, 1962
Source: Library of Congress, Periodicals 1962

Newsstand Date November 1, 1962
Source: Newsdealer Magazine, V17 #10

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

Title: "The Cavern of Deadly Spheres"
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 #113 (1974)
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 #15; next appearance in Justice League of America #17)
• Superman (last appearance in Action Comics #295; next appearance in Superman #158)
• Batman (last appearance in Detective Comics #310; next appearance in Detective Comics #311)
• Flash (last appearance in Flash #133; next appearance in Flash #134)
• Wonder Woman (last appearance in Wonder Woman #134; next appearance in Wonder Woman #135)
• Green Lantern (last appearance in Green Lantern #17; next appearance in Green Lantern #18)
• Martian Manhunter (last appearance in Detective Comics #310; next appearance in Detective Comics #311)
• Aquaman (last appearance in World's Finest Comics #130; next appearance in Aquaman #7)
• Green Arrow (last appearance in World's Finest Comics #130; next appearance in World's Finest Comics #131)
• Atom (last appearance in Atom #4; next appearance in Atom #5)

Supporting Character(s)

• Snapper Carr (last appearance in Atom #4; next appearance in Justice League of America #17)

Villain(s)

• The Maestro and his henchmen (imaginary appearance)

Other Character(s)

• Jerry Thomas (behind-the-scenes; a young Justice League fan; character named for fans Jerry Bails and Roy Thomas; makes no physical appearance in story; no further appearances)

Comments:
This adventure does not actually happen. The Justice League solves an imaginary case posed by one of its fans.

The Maestro is not to be confused with Anton Allegro, the villainous maestro who first appears in Justice League of America #163, or with the Maestro who first appears in Justice League of America #237.

Synopsis:
Three Justice League teams, on their way to a meeting, foil robberies masterminded by a villain called the Maestro, who uses his unique music to make the super-heroes dance uncontrollably. Trailing the villain to his cavern hideaway, the members are trapped in bubbles which are proof against their powers. The situation seems hopeless, but it turns out that these happenings are merely part of a story written by JLA fan and amateur cartoonist Jerry Thomas, who has sent his idea for an inescapable doom-trap to the heroes, in hopes that they can come up with a solution for it.

After wracking their brains for an answer, the League is at a loss, until the Atom points out that he was too small to have heard the Maestro’s music at one point of the story – which would indicate that something else was causing the effect. Thus aware of the true source of the villain’s power – a cosmi-radio beam affecting the motor centers of the brain – the heroes are able to immunize themselves, escape the trap, and capture the Maestro.