Alastair Mackenzie (born February 8, 1970) played Martin in Doctor Who. He has also played Julian St. Stephen in Counter-MeasuresAdric Traken in the Big Finish Doctor Who audio stories Prisoners of Fate and The Entropy Plague and robots in the latter.

He is best known for playing Archie MacDonald in the BBC drama series Monarch of the GlenTom Baker played his uncle Donald Ulysses MacDonald on the series.

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