The mysterious caller as he's (almost) seen in "The Dark Side of the Mook".
The mysterious caller is a person who makes several phone calls to Det. Sam Tyler during the series. His face is never shown (however it is revealed who he is towards the end of the series) and he always disguises his voice with a voice changer.
Trivia[]
| Characters of Life on Mars (US) |
|---|
      Det. Sam Tyler / Lt. Gene Hunt / Annie Norris / Det. Ray Carling / Det. Chris Skelton / Maya Daniels |