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"The Mystery of Spaceman X!": The Justice League is called away to three planets of a distant star system to destroy doom machines that imperil those planets' inhabitants. Each group of the League believes themselves to have failed and returns to Earth to find a giant spaceman acting strangely b

Justice League of America #20 is an issue of the series Justice League of America (Volume 1) with a cover date of June, 1963.

Synopsis for "The Mystery of Spaceman X!"

The Justice League is called away to three planets of a distant star system to destroy doom machines that imperil those planets' inhabitants. Each group of the League believes themselves to have failed and returns to Earth to find a giant spaceman acting strangely benevolent.

Realizing that Spaceman X is really a robot the League tries to find the source of its control. It's revealed that the spaceman's spaceship is actually a living being in disguise and has been using the robot to channel energy to become invulnerable. Superman is able to defeat him with his super strength, rendering the Spaceman X inert, and ending it's threat.

Appearing in "The Mystery of Spaceman X!"

Featured Characters:

Supporting Characters:

Antagonists:

  • Unnamed Metal Alien (Single appearance)
    • Spaceman X

Other Characters:


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