Rover is a fictional entity from the 1967 British television program The Prisoner, and was an integral part of the way 'prisoners' were kept within The Village. It was depicted as a floating white ball that could coerce, and, if necessary, disable inhabitants of The Village, primarily Number Six. In one incident, it even killed a person, but it is not clear whether the ability to kill was a normal feature of Rover or if this incident was a malfunction. Several aspects of the Rover device were not explained, presumably left to the imagination/speculation of the viewer.