From Wikipedia: Neil John McCallum (1929–1976) was a British-Canadian actor. After attending the Guildhall School of Music and Drama in London, McCallum's first major appearance on stage was alongside Sam Wanamaker in The Rainmaker in the mid-1950s.[3] He appeared in British TV series in the 1950s, 1960s and early 1970s, including The Saint, Department S and UFO, and in films such as The Siege of Pinchgut (1959) and Dr. Terror's House of Horrors (1965).[4] He provided the voices of Dr Ray Pierce in the film Thunderbirds Are Go (1966) and an airport controller in the TV series Captain Scarlet and the Mysterons (1967).[5] He played lead character Angelo James in the BBC TV series Vendetta (1966-68). He was also a scriptwriter (scripting two 1964 thrillers, Do You Know this Voice? and Walk a Tightrope, among other things), a producer and occasional director.
Walk a Tightrope
1963
Thunderbirds Are GO
1966
Moon Zero Two
1969
Dr Terror's House of Horrors
1965
The Longest Day
1962
Foxhole in Cairo
1960
The Inspector
1962
The Lost Continent
1968
Captain Scarlet vs. The Mysterons
1980
The Siege of Pinchgut
1959
The War Lover
1962
Catacombs
1965
The Devil's Disciple
1959
Quest for Love
1971
Jet Storm
1959