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HistoryWhen the Green Lantern Corps still existed, the deadliest criminals of the known universe (too dangerous to be sentenced to Takron-Galtos or the Guardians' Prison Planet) were imprisoned on the planet Oa, in so-called "Sciencells" powered by the Central Power Battery. Criminals that were imprisoned in the Sciencells included: Sinestro, Goldface, Evil Star, Myrwhydden, and Sector 3600.
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