The Ood are a humanoid like race of aliens whose heads resemble squids. The Oods brains are outside their heads in a ball which the Ood hold most of the time. The first encounter with the Ood is in an episode called the 'Impossible planet'. The Ood are used as workers on the planet but it is not their freedom that the Doctor has come to seek, it is the ancient evil at the heart of the planet.
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