In the 1950s and 1960s, Matthews" film roles for Hammer Studios included the Baron"s assistant in The Revenge of Frankenstein (1958) and the heroes of Dracula: Prince of Darkness and Rasputin, the Mad Monk (both 1966). On television, from 1969 to 1971, he played Francis Durbridge"s amateur private detective Paul Temple in the British Broadcasting Corporation series of the same name. He also appeared throughout the 1960s and 1970s in a variety of television comedy roles, including Eric & Ernie"s Christmas Show, 1977.
He appeared alongside George Cole in Charles Woods" sitcom Don"t Forget To Write! (1977) as a successful writer
In 1967, Matthews supplied the voice of Captain Scarlet for Gerry and Sylvia Anderson"s Supermarionation television series Captain Scarlet and the Mysterons. In the late 1970s, he served as narrator and host for Follow Maine!, a British Broadcasting Corporation educational programme that offered a "crash course" in the English language to foreign viewers.
He died on 14 June 2014 at the age of 86 following a short illness.