
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.

Scarface
1932 · as Gaffney

Frankenstein
1931 · as The Monster

How the Grinch Stole Christmas!
1966 · as Narrator / The Grinch (voice)

Bride of Frankenstein
1935 · as The Monster

The Mummy
1932 · as Imhotep / Ardath Bey

The Movie Orgy
1968 · as Self (archive footage)

Unconquered
1947 · as Guyasuta, Chief of the Senecas

Targets
1968 · as Byron Orlok

The Raven
1963 · as Dr. Scarabus

Legacy of Screams: The Evolution of Horror Movies
2025 · as Self - (archive footage)

The Black Cat
1934 · as Hjalmar Poelzig

The Terror
1963 · as Baron Victor Frederick Von Leppe

Son of Frankenstein
1939 · as The Monster

Black Sabbath
1963 · as Gorca (segment "The Wurdalak")

The Lost Patrol
1934 · as Sanders

Tap Roots
1948 · as Tishomingo

Bedlam
1946 · as George Sims

Five Star Final
1931 · as T. Vernon Isopod