123Movies. The Ultimate Guide was a documentary made by BBC Events Production in London which aired on BBC Three in the run-up to the 50th anniversary of the Doctor Who. It gave a broad overview of the show's history, and interviewed many people involved in its production over the years, including five of the actors who portrayed the Doctor: Peter Davison, Colin Baker, Sylvester McCoy, Paul McGann and David Tennant — as well as the current executive producer and head writer Steven Moffat.