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Ux-Mal is an inhabited star system. In the 19th century, a number of criminals from Ux-Mal were exiled to a moon of Mab-Bu VI. Their consciousness was separated from their bodies, and left adrift to suffer in the moon's intense electromagnetic storms.
When the USS Enterprise-D attempted to identify the source of the distress call from Mab-Bu VI, the criminal entities took over the minds of Data, Troi, and Miles O'Brien.(TNG: "Power Play")
Troi and Data taken over by Ux-Mal criminals.
Troi and O'Brien struck by the plasma shock
Hundreds of condemned prisoners from Ux-Mal.