The Brain Slugs are small, gelatinous, fist-sized aliens that attach themselves to human heads and act as mind-control devices, reducing their hosts to a zombie-like state. Aside from the obvious fact that the person has a Brain Slug attached to them, the Brain Slugs further betray their hosts' possessed state by speaking through their hosts in the third person ("Hermes enjoyed it" being just one example) and in a monotone voice-wiki