The Great Earth-Mars Mystery – John Jones is investigating crimes on Earth with a crook who vanishes into a river when he finds a way to get a broadcast through to his parents back home on Mars. They are experiencing a similar crime wave, and that inspires Jones to deduce the answer.
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| Character | Robin (Dick Grayson), Martian Manhunter (J'onn J'onzz), Batman (Bruce Wayne) |
| Cover Date | October 1956 |
| Issue | 236 |
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| Artist | Joe Certa |
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| Writer | Jack Miller |
