One. Every time he regenerates, a new actor comes.
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Sylvester McCoy, the Seventh Doctor, and David Tennant, the Tenth Doctor, are the only Scottish actors to have "officially" played the Doctor, though many companions and side-characters have been Scottish. UPDATE: As of 2014, Peter Capaldi has taken on the role of the Twelfth Doctor becoming the third Scottish actor to "officially" play the Doctor.
Including the newest one, there have been 11 incarnations of The Doctor, though there have been 12 actors. The First Doctor was recast for his appearance in "The Five Doctors" due to the original actor's death. So, there have been 12 actors, portraying 11 different incarnations.
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Mrs Santa Claus was played by Angela Lansbury in the 1996 television musical. There have been many other actors who portrayed Mrs Claus in other films, and television shows as well.
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