Alastair Mackenzie

Alastair Mackenzie, also credited as Alistair MacKenzie, played Julian St. Stephen in Counter-Measures, Adric 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. Tom Baker played his uncle Donald Ulysses MacDonald on the series.