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| Publisher |
DC |
| Artist |
Mike Sekowsky |
| Writer |
Gardner Fox |
| Cover Artist |
Mike Sekowsky |
| Inker |
Bernard Sachs |
| Published | August 1962 |
THE RIDDLE OF THE ROBOT JUSTICE LEAGUE! The JLA find themselves on a far off planet where they must battle robotic versions of themselves in order to save that planet - and earth- from alien conquest. Using scientific explanation & reasoning, Gardner Fox proceeds to demonstrate how our heroes can overcome their never tiring counterparts. This story is not only great entertainment, but also scientifically educational.
