The Ood have had many appearances in the new Doctor Who series,starting with The Satan's pit in series 2, right up  to the more recent Doctor's Wife.
They are a humanoid species
with coleoid tentacles on the lower portions of their faces. They have no vocal chords and instead communicate by telepathy. The Ood were originally a hive mind led by the Ood Brain, using their hindbrain to "sing" with each other. The colour of an Ood's eyes changed with the level of telepathic activity, normally glowing bright-red but turning to white when not connect
ed to a hive mind. Humans, who only knew the Ood in their telepathy-disabled form, misinterpreted the presence of red eyes as a disease, known as Red Eye. The hindbrain processed memory and emotions, leading to mental instabilities when removed, even though the Ood could survive with it being removed and replaced with the more commonly seen telepathy ball.

This costume was relatively simple to construct, I decided to repaint the mask as I wasn't happy with the colourI am also in the process of moving the switch that makes the ball light up.  I may also do a natural Ood using the same mask but swapping the ball for a brain.