 He did another OSS 117 film, "Panic in Bangkok" (1964), then starred in "The Viscount" (1967), also from a novel by Bruce.In between, he starred in a pilot for "Ghost Breakers", a TV show that did not go to series.Mathews starred in some low-budget films, such as "Battle Beneath the Earth" (1968) filmed in England and "Un killer per sua maestà" (1968).