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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.

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

The Last Repair Shop
as The Monster (archive footage) (uncredited)
Boris Karloff: The Rest of the Story
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Boris Karloff: The Man Behind the Monster
as Self (archive footage)

Hollywood in the Atomic Age: Monsters! Martians! Mad Scientists!
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True Fear: The Making of Psycho
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Jack Pierce: The Man Who Made the Monsters
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Monster Madness: The Golden Age of the Horror Film
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A Masque of Madness (Notes on Film 06-B, Monologue 02)
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Classic Movie Bloopers: Uncensored
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The Complete Bob Wilkins Creature Features

He Who Made Monsters: The Life and Art of Jack Pierce
as Self (archive footage)

Bela Lugosi: The Fallen Vampire
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Ian Rankin Investigates: Dr. Jekyll & Mr. Hyde
as Cabman John Gray (archive footage)

Famous Monster: Forrest J Ackerman
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Lugosi: The Dark Prince
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Karloff: The Gentle Monster
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Terror in the Tropics
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Monster Movie Trivia Quiz

The Mesmerist
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Heroes of Horror
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The American Nightmare
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Mummy Dearest: A Horror Tradition Unearthed
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The Many Faces of Dracula
as The Monster (archive footage)

The 'Frankenstein' Files: How Hollywood Made a Monster
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Monster by Moonlight! The Immortal Saga of 'The Wolf Man'
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Universal Horror
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The Universal Story
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Abbott and Costello Meet Jerry Seinfeld
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How the Grinch Stole Christmas! Special Edition
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Dracula in the Movies

Halloween Monster Bash
as Baron Von Leppe (archive footage)

Dracula: A Cinematic Scrapbook
as Doctor Gustav Niemann (archive footage)
Frankenstein: A Cinematic Scrapbook
as The Monster / Gustav Niemann / Dr. Jekyll / Mr. Hyde / etc.

Myrna Loy: So Nice to Come Home To
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Abbott and Costello in the Movies
as Archival

Transylvania Twist
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Hollywood Scandals and Tragedies
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Creepy Classics
as Dr. Scarabus - (archive footage)

Going Hollywood: The '30s
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The Horror of It All
as Frankenstein / Cabman John Gray (archive footage)

Oops, Those Hollywood Bloopers!
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Monsters on the March (and a Pair of Marvels!)

The Horror Show
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Brother, Can You Spare a Dime?
as Self (archive footage)

Madhouse
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The Horror Hall of Fame: A Monster Salute
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Alien Terror
as Prof. John Mayer

Isle of the Snake People
as Carl van Molder / Damballah

Hatchet for the Honeymoon
as Gorca (archive footage)

McCloud
as Hjalmar Poelzig (archive footage) (uncredited)

Curse of the Crimson Altar
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The Name of the Game
as Mikhail Orlov

Targets
as Byron Orlok

Fear Chamber
as Dr. Carl Mandel

Macabre Serenade
as Matthias Morteval

Cauldron of Blood
as Franz Badulescu

The Movie Orgy
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The Sorcerers
as Prof. Marcus Monserrat

Mad Monster Party?
as Baron Boris von Frankenstein (voice)