The Ood on today’s 51 Days of Doctor Who! Not really a baddie in the sense that the Ood are inherently evil, but they do seem to be taken over by other baddies an awful lot. Most Ood are friendly, mildly telepathic aliens that can share in a hive mind. They have 2 brains, and have a fondness for communicating through singing on octaves humans cannot hear.

In the past, they have been used and exploited as a slave race for their docile nature.

The Ood first appeared in Doctor Who in The Impossible Planet in 2006.