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.
Bride of Frankenstein
The Monster
Scarface
Gaffney
Abbott and Costello Meet Dr. Jekyll and Mr. Hyde
Dr. Henry Jekyll / Mr. Hyde
Frankenstein
The Monster
Son of Frankenstein
The Monster
House of Frankenstein
Dr. Gustav Niemann
Frankenstein 1970
Baron Viktor von Frankenstein
The Mask of Fu Manchu
Dr. Fu Manchu
The Movie Orgy
Self (archive footage)
Lured
Charles van Druten
The Devil Commands
Dr. Julian Blair
Devil's Island
Dr. Charles Gaudet
The Boogie Man Will Get You
Prof. Nathaniel Billings
The Black Castle
Dr. Meissen
The Body Snatcher
John Gray
Isle of the Dead
Gen. Nikolas Pherides
The Man Who Changed His Mind
Dr. Laurence
Corridors of Blood
Dr. Thomas Bolton
Juggernaut
Dr. Victor Sartorius
Tap Roots
Tishomingo
Doomed to Die
James Lee Wong
He Who Made Monsters: The Life and Art of Jack Pierce
Self (archive footage)
Mr. Wong, Detective
James Lee Wong
Bedlam
George Sims
The Black Cat
Hjalmar Poelzig
The Old Dark House
Morgan
The Terror
Baron Victor Frederick Von Leppe
The White Panther
Shere Ali's Aide (as Karloff Boris)
The Hellion
The Outlaw
The Lightning Raider
Riders of the Plains
The Prince and Betty
Undetermined Role
Forbidden Cargo
Pietro Castillano
Perils of the Wild
Lady Robinhood
Cabraza
The Courage of Marge O'Doone
Tavish
Never the Twain Shall Meet
Without Mercy
Madame Gordon's 2nd Henchman (uncredited)
Cheated Hearts
Nei Hamid
The Golden Web
Dave Sinclair
Flames
Blackie Blanchette
Flaming Fury
Gaspard
Let It Rain
Crook
The Princess from Hoboken
Pavel
The Meddlin' Stranger
Al Meggs
Soft Cushions
The Chief Conspirator
The Vanishing Rider
The Villain
Sharp Shooters
Cafe Proprietor (uncredited)
Vultures of the Sea
Grouchy
The Man with Nine Lives
Dr. Leon Kravaal
Burning the Wind
Pug Doran
Before I Hang
Dr. John Garth
The Man They Could Not Hang
Dr. Henryk Savaard
The Little Wild Girl
Maurice Kent
The Black Room
Baron Gregor de Berghman / Anton de Berghman
The Devil's Chaplain
Boris
Two Sisters
Cecil
The Fatal Warning
Mullins
The Bad One
Monsieur Gaston
The Unholy Night
Abdul Mohammed Bey - the Hindu Lawyer (uncredited)
Business and Pleasure
Sheik Ali-Ben Joseph
The Emperor's Nightingale
Narrator (English version)
The Walking Dead
John Ellman
Bud Abbott and Lou Costello Meet the Killer, Boris Karloff
Swami Talpur
Monster Movie Trivia Quiz
How the Grinch Stole Christmas!
Narrator / The Grinch (voice)
Nan of the North
Undetermined Role (uncredited)
The Man from Downing Street
Maharajah Jehan
The Infidel
The Nabob
Omar the Tentmaker
Imam Mowaffak
The Woman Conquers
Raoul Maris
The Altar Stairs
Hugo
The Prisoner
Prince Kapolski
The Horror Show
(archive footage)
The Invisible Ray
Dr. Janos Rukh
Black Sabbath
Gorca (segment "The Wurdalak")
The Ghoul
Prof. Morlant
King of the Wild
Mustapha
Night Key
David Mallory
Charlie Chan at the Opera
Gravelle
Curse of the Crimson Altar
Professor John Marsh
The Secret Life of Walter Mitty
Dr Hugo Hollingshead
Behind the Mask
Jim Henderson
Tower of London
Mord
Black Friday
Dr. Ernest Sovac
The Raven
Dr. Scarabus
Madhouse
(archive footage)
Die, Monster, Die!
Nahum Witley
The Comedy of Terrors
Amos Hinchley
Alien Terror
Prof. John Mayer
Five Star Final
T. Vernon Isopod
The Criminal Code
Ned Galloway
The Ape
Dr. Bernard Adrian
The Mummy
Imhotep / Ardath Bey
The Mummy's Hand
Kharis (archive footage / uncredited)
Voodoo Island
Phillip Knight
The Mummy's Curse
Kharis in Flashback (archive footage / uncredited)
The Island Monster
Don Gaetano
The Raven
Edmond Bateman
Behind That Curtain
Beetham's Manservent
The Lost Patrol
Sanders
Mad Monster Party?
Baron Boris von Frankenstein (voice)
The Climax
Dr. Friedrich Hohner
The Strange Door
Voltan
Smart Money
Sport Williams
Fear Chamber
Dr. Carl Mandel
Macabre Serenade
Matthias Morteval
Isle of the Snake People
Carl van Molder / Damballah
Targets
Byron Orlok
You'll Find Out
Judge Spencer Mainwaring
British Intelligence
Valdar
Dick Tracy Meets Gruesome
Gruesome
Unconquered
Guyasuta, Chief of the Senecas
Boris Karloff: The Man Behind the Monster
Self (archive footage)
The Sorcerers
Prof. Marcus Monserrat
Creepy Classics
Dr. Scarabus - (archive footage)
The Lark
Bishop Cauchon
The American Nightmare
Self
The House of Rothschild
Count Ledrantz
Grip of the Strangler
James Rankin
Mr. Wong in Chinatown
Mr. James Lee Wong
The Mystery of Mr. Wong
James Lee Wong
The Fatal Hour
James Lee Wong
The Ghost in the Invisible Bikini
The Corpse
Cauldron of Blood
Franz Badulescu
The Venetian Affair
Dr. Pierre Vaugiroud
Tonight or Never
Waiter
Sting of Death
Mr. Mycroft
Tarzan and the Golden Lion
Owaza
A Fool's World
Narrator
The Mad Genius
Fedor's Father (uncredited)
The Vanishing Legion
The Voice (voice)
Dracula: A Cinematic Scrapbook
Doctor Gustav Niemann (archive footage)
The Many Faces of Dracula
The Monster (archive footage)
Gift of Gab
Himself
The Public Defender
The Professor
Graft
Terry
The Nickel-Hopper
Dance Hall Masher
The Bells
The Mesmerist
Oops, Those Hollywood Bloopers!
Self (archive footage)
The Sea Bat
Corsican
The Invisible Menace
Jevries
West of Shanghai
"General" Wu Yen Fang
The Guilty Generation
Tony Ricca
Dynamite Dan
Tony Garcia
Monster Madness: The Golden Age of the Horror Film
Various roles (archive footage)
The King of the Kongo
Scarface Macklin
The Daydreamer
The Rat (voice)
Cracked Nuts
Boris - First Revolutionary
Night World
'Happy' MacDonald
Lugosi: The Dark Prince
Self (archive footage)
Going Hollywood: The '30s
(archive footage)
The Horror of It All
Frankenstein / Cabman John Gray (archive footage)
The Miracle Man
Nikko
Classic Movie Bloopers: Uncensored
Self (archive footage)
Two Arabian Knights
Purser
The Utah Kid
Henchman Baxter
The Last of the Mohicans
Indian (uncredited)
Abbott and Costello in the Movies
Archival
The Eagle of the Sea
Pirate (uncredited)
The Phantom Buster
Ramon
The Juggler of Our Lady
Narrator (voice)
The Last Repair Shop
The Monster (archive footage) (uncredited)
Bela Lugosi: The Fallen Vampire
Himself (archive footage)
Old Ironsides
Saracen Guard (uncredited)
The Deadlier Sex
Jules Borney
The Yellow Ticket
Drunken Orderly
Days of Thrills and Laughter
Self (archive footage)
Hollywood in the Atomic Age: Monsters! Martians! Mad Scientists!
Self (archive footage)
Colonel March Investigates
Colonel March
Skyscraper Souls
Man Approaching Ticket Counter
Monsters on the March (and a Pair of Marvels!)
The Fatal Impulse
Self
I Like Your Nerve
Luigi - Pacheco's Butler
Transylvania Twist
Man in Room (archive footage)
Boo
Frankenstein's Monster (edited from "Frankenstein")
Little Lost Robot
Host
A Connecticut Yankee
King Arthur
The Cave Girl
Baptiste
Mummy Dearest: A Horror Tradition Unearthed
Self (archive footage)
Terror in the Tropics
Mr. Wong (archive footage)
Bikini Beach
Art Dealer
His Majesty, the American
Henchman in cloth cap
Breakdowns of 1937
Self
The Cohens and Kellys in Hollywood
Boris Karloff
Brother, Can You Spare a Dime?
Self (archive footage)
The Mesmerist
(archive footage)
Hedda Hopper’s Hollywood No. 6
Himself
Karloff: The Gentle Monster
Self (archive footage)
The 'Frankenstein' Files: How Hollywood Made a Monster
Self (archive footage)
Young Donovan's Kid
Cokey Joe
Myrna Loy: So Nice to Come Home To
(archive footage)
The Love Mart
Fleming
The Universal Story
Self (archive footage)
Ian Rankin Investigates: Dr. Jekyll & Mr. Hyde
Cabman John Gray (archive footage)
The Hope Diamond Mystery
Priest of Kama-Sita / Dakar
Sabaka
General Pollegar
The Greater Glory
Scissors Grinder
Arsenic & Old Lace
Jonathan Brewster
The Prairie Wife
Diego
Without Benefit of Clergy
Ahmed Khan
Her Honor, the Governor
Snipe Collins
Jack Pierce: The Man Who Made the Monsters
Self (archive footage)
Doom of Dracula
The Madman (archive footage)
Screen Snapshots No. 11
Himself
Parisian Nights
Pierre
Heart of Darkness
Mr. Kurtz
The Man in the Saddle
Robber (uncredited)
The Incredible Doktor Markesan
Dr. Konrad Markesan
Hatchet for the Honeymoon
Gorca (archive footage)
The Complete Bob Wilkins Creature Features
The Storm
Famous Monster: Forrest J Ackerman
Self (archive footage)
Monster by Moonlight! The Immortal Saga of 'The Wolf Man'
Self (archive footage)
Universal Horror
(archive footage)
Horror!!!
Self
How the Grinch Stole Christmas! Special Edition
(voice - archive footage)
Abbott and Costello Meet Jerry Seinfeld
Self (archive footage)
The Dark Universe
La Momia (archivo de imagen)
The Dark Universe
La Momia (archivo de imagen)
Rendezvous in Black
Ward Allen
Hollywood Scandals and Tragedies
Lizard's Leg and Owlet's Wing
The Grim Reaper
Self
The Woman and the Puppet
(uncredited)
Legacy of Screams: The Evolution of Horror Movies
Self - (archive footage)