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Fifteen Beta Three is an antebellum Centurion responsible for leading the Caprican Cylon Brigade during the Third Colonial Conflict.
From Three, William Adama learns that the Brigade was abandoned by their human Caprican military commander more than 50 years ago. Seeing as the Cylons only have antebellum Raiders and no basestar—due to its destruction by Adama's tactical nuclear device (Battlestar Galactica 3)—he leads them back to the Fleet, even knowing that Three and his ilk may eventually turn on their creators like their brethren had nearly five decades ago (Battlestar Galactica 4).