The Ood are a species of Cephalopod-faced humanoids who communicate via telepathy. The colour of their eyes change to a glowing bright red when connected to a hive mind. Besides a forebrain in the head, they are seen holding their external hindbrain, replaced with a translation sphere since the 39th century, when humanity enslaved the Ood, thus altering their mental abilities.
They made their television debut in the tenth Doctor (David Tennant) episode The Impossible Planet (2006). Appearing on and off during the Tenth Doctor’s timeline before foreseeing his end.