
Boris Karloff
William Henry Pratt (November 23, 1887 – February 2, 1969), better known as Boris Karloff, was an English-born actor who emigrated to Canada in 1909. Karloff is best remembered for his roles in horror films and his portrayal of Frankenstein's monster in Frankenstein (1931), Bride of Frankenstein (1935), and Son of Frankenstein (1939). His popularity following Frankenstein was such that for a brief time he was billed simply as "Karloff" or "Karloff the Uncanny". His best-known non-horror role is as the Grinch in the television special of Dr. Seuss’s How the Grinch Stole Christmas!. Description above from the Wikipedia article Boris Karloff, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Movies

Bride of Frankenstein
1935
as The Monster

The Mummy
1932
as Imhotep / Ardath Bey

Sleepy Hollow
1999
as Host

Son of Frankenstein
1939
as The Monster

Frankenstein
1931
as The Monster

Unconquered
1947
as Guyasuta, Chief of the Senecas
Web Series

Bananas in Pyjamas
1992
as Dr. Gustav Niemann

Caprica
2010
as Gaffney