Born William Henry Pratt (23 November 1887 – 2 February 1969) was an English actor who emigrated to Canada in the 1910s. Pratt travelled to Canada and some time later changed his professional name to "Boris Karloff". He is best remembered for his roles in horror films and his portrayal of Frankenstein's monster in the 1931 film Frankenstein, 1935 film Bride of Frankenstein and 1939 film Son of Frankenstein. His popularity following Frankenstein in the early 1930s was such that for a brief time he was billed simply as "Karloff" or, on some movie posters, "Karloff the Uncanny".

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