Boris Karloff
From The Arthur Conan Doyle Encyclopedia

Boris Karloff as Mr. Mycroft in the episode Sting of Death (1955)
Boris Karloff (23 november 1887 - 2 february 1969) was an British actor wellknown as one of the true icons of horror cinema (Frankenstein...) who played Mr. Mycroft in the episode Sting of Death of the TV series The Elgin Hour in 1955.
TV
- 1955 : Sting of Death (as Mr. Mycroft)