Number 40 was the title of a scientist employed by The Village. The character appears in the eighth episode ("Dance of the Dead") of the the 1967-68 British television series The Prisoner and was portrayed by Scottish actor Duncan Macrae.
Background
The scientist Number 40 attempts to extract information from Number 6 by having 6's former colleague Roland Walter Dutton (now Number 42) call him while he is under a sort of electronic hypnosis. Number 6 resists and is suspicious of what is happening; Number 2 orders the dangerous plan to be abandoned. Number 40 later takes part in a kangaroo court with Number 6 on trial for the possession of a radio. Still wearing his Napoleon Bonaparte attire from the preceding fancy dress ball, he serves as one of the three judges. The trial ends with Number Six being sentenced to death.