On television, his roles have included guest appearances in Survivors, The Life and Times of David Lloyd George, Rab C. Nesbitt and Doctor Who, first as an extra in The Enemy of the World (1967–1968), then as a soldier in The War Games (1969), both times alongside his father who played the Second Doctor, and in a considerably larger role as King Peladon in The Curse of Peladon (1972). In the television adaptation of Alan Ayckbourn's trilogy The Norman Conquests (1977), Troughton appeared as Tom, the veterinarian; later he was the physician Bob Buzzard in the two series of A Very Peculiar Practice (1986 and 1988). He was Uncle Sid in Cider with Rosie (1998) and also appeared in the role of Sir Arthur Wellesley (the Duke of Wellington) in the first two episodes of Sharpe. He appeared as an alien hunter in the comedy/drama mini-series Ted and Alice in 2002, and in 2005 he also played Sgt. Clive Harvey, side-kick to the title character of the ITV detective show Jericho. He appeared in an episode of Agatha Christie's Poirot in 1993 (The Yellow Iris), and in two separate episodes of Midsomer Murders, in 1998 and 2007, playing two separate characters. He appeared in the first episode of the TV adaptation of The Last Detective in which his A Very Peculiar Practice co-star Peter Davison (also ex-Doctor Who) starred.