Zombie

Zombies, also spelled zombi (PROSE: White Darkness) and called the walking dead, (AUDIO: Mask of Tragedy) were "the living dead," creatures of the undead in different cultures.

Illusions
While not truly being "undead," it was possible (and often done by tribes in Haiti) to trick a human into believing they were one of the "living dead" using the drug tetrodotoxin. In correct doses, it could lower the consciousness of a person and take away their sensory nerves. The person would then be buried and dug up, making them think they had been brought back to life. They would subsequently be used as slaves. (PROSE: White Darkness)

Behind the scenes

 * David A. McIntee, when writing White Darkness, took inspiration and facts from the non-fiction book The Serpent and the Rainbow, which detailed accounts of zombification that occurred in Haiti in the early 20th century. He advised staying away from the film version.
 * The humanoid antibodies created by the Exxilon City's "brain" to destroy the Third Doctor and Bellal in part four of Death to the Daleks were credited as "Zombies" in Radio Times.