Alastair Mackenzie

Alastair Mackenzie, also credited as Alistair MacKenzie, (born 8 February 1970) played Julian St. Stephen in Counter-Measures, Adric Traken in the Big Finish Doctor Who audio story 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. Tom Baker played his uncle Donald Ulysses MacDonald on the series.