OOD / OODKIND

Planet of Origin: Ood Sphere, a planet from a system of two suns, situated in the Horsehead Nebula, some 1500 light years from Earth, is the home of the sensorites. Another planet in the same system, the Sense sphere, houses a genetically related species, the Sensorites. Although not a gestalt, the Sensorites are also telepahtic. How those two species, most probably of common origin managed to end up on different planets remains unknown.
The Ood are a long lived pacific telepathic humanoid species which developed as a gestalt into an early industrial civilisation. They live as a hive mind led by the Ood Brain, a huge living brain that ontrolled the connection between individual Ood and which is able to reach any Ood over intergalactic distances. They have coleoid tentacles on the lower portions of their faces, no vocal cords and instead communicated by telepathy. They  posses two brains; a forebrain in the head and a secondary hindbrain connected by an umbilical cord-like connection to their faces, usually held in their hands. The forebrain does much of the thinking and stores the telepathic sensors. The hindbrain processed memory and emotions, leading to mental instabilities when removed, even though the Ood can survive without it.  In the 39th century, humanity discovered the Ood, enslaved them, and used them to perform menial tasks throughout the intergalactic slave trade. The external hindbrain of the Ood was extracted and replaced by translator globes by Ood Operations, a corporation in charge of managing their world. This procedure was kept from the general public which believed the Ood naturally servile. By the 42nd century, it was claimed that every human had an Ood servant. Apart from activist groups, they were generally barely even regarded as being alive, and were considered to be expendable.
Source: Doctor Who (TV: Planet of the Ood)  (TV: The End of Time) (TV: Planet of the Ood)