What does OOD mean in Unclassified?

Ood

The Ood are an alien species with telepathic abilities from the long-running science fiction series Doctor Who. In the series' narrative, they live in the distant future (circa 42nd century). The Ood are portrayed as a slave race, naturally gentle and kind but readily susceptible to corrupting external influence. They are later emancipated from their slavery and by The End of Time have progressed into an advanced civilization, a development which the Doctor thinks to be impossible, given the time span, 100 years, over which it has occurred.

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