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This story continued from Superboy #16 and continued in Superman #16.
This story continued from Superboy #16 and continued in Superman #16.
Superboy follows after Superman into another dimension and they find themselves on a sentient planet that was originally designed to heal people. But instead it was taken over by evil men who turned it into a murderous prison. Superboy is able to communicate with the planet and get it to help them return home.