Skeletoid

The Skeletoids were suits which could take over their wearers. They required a living Human in order to function. These Humans would be mind-controlled and preserved by the suit, though they would look like decayed corpses.

They has emerged as a serious threat to even the Daleks and the Cybermen. (DWM: Kane's Story, Frobisher's Story)

Behind the scenes

 * Skeletoids were similar in appearance to the Vashta Nerada and the Skeleton Crew. (DW: Silence in the Library/Forest of the Dead, The Infinite Quest)