[8] His film roles include appearances in Operation Snatch (1962), A Jolly Bad Fellow (1964), Rasputin, the Mad Monk (1966), Mosquito Squadron (1969), Every Home Should Have One (1970), Young Winston (1972), Digby, the Biggest Dog in the World (1973), International Velvet (1978), Morons from Outer Space (1985)[1] and both The Buccaneers and The Steal in 1995.
Dinsdale Landen was the only actor to play the same character, private detective Matthew Earp, in two episodes of Thriller ("An Echo of Theresa" and "The Next Scream You Hear" from 1973 and 1974 respectively).
[17] In 1989, he made a guest appearance in Doctor Who as Dr. Judson, a wheelchair-using genius taken over by the titular villain of the serial The Curse of Fenric.
[18] In 1992, Landen provided the voice of the arch villain Mr. Tod in the BBC/Fuji Television children's animated series The World of Peter Rabbit and Friends.
[21] Landen died at his home in South Creake, Norfolk, on 29 December 2003 after becoming ill with pneumonia.