Doctor Who: EVERY NuWho Villain And Monster Ranked Worst To Best

Appear in: Asylum of the Daleks, The Time of the Doctor, The Magician's Apprentice.

Those dastardly Daleks even have sleeper agents. They come about when any organic matter combines with Dalek nanogenes, including converting the dead. The puppets make a grim sound on activation when the eyestalk penetrates the skull's forehead, and even grimmer how a person's memories are exploited for deep cover and merely referred to as their "file".