The unknown universe was a part of the (PROSE: The Day of the Doctor) constantly expanding universe that was the Totality. (TV: The Power of Three) In contrast to the the known universe and partly known universe, the unknown universe represented the unexplored space of the dimension. During the Last Great Time War, the unknown universe became home to some of the fighting, with the campaign led by the Doctor of War becoming the bloodiest crusade in the unknown universe's history. (PROSE: The Day of the Doctor)
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