2012Le Mystère Bardot
2004Back When We Were Grownups— Paul 'Poppy' Davitch
2002Living with the Dead— Allan Van Praagh
2001Prancer Returns
2001The Omen Legacy— Narrator (voice)
1999Sarah, Plain and Tall: Winter's End— John Witting
1999Treasure Island— Long John Silver
1999Joe D'Amato Totally Uncut - The Erotic Experience— (archive footage)
1998Ebenezer— Ebenezer Scrooge
1998The Incredible Adventures of Marco Polo— Beelzebub
1997Monster Mania— Host
1997I'll Be Home For Christmas— Bob Greiser
1996Joan Crawford: Always the Star— Self (archive footage)
1995Rod Serling: Submitted for Your Approval— Self
1995Buffalo Kızlar— Bartle Bone
1994Çılgın Sahtekârlar— Duke Page
1994Kuğu Prenses— Lord Rothbart (voice)
1994Cops & Robbersons— Jake Stone
1994The Twilight Zone: Rod Serling's Lost Classics— Dr. Jeremy Wheaton (segment "Where the Dead Are")
1993Cyborg 2— Mercy
1992Solar Crisis— Travis
1992Legends of the West— Host / Self - Judge Roy Bean
1992Keep the Change— Overstreet
1992When It Was a Game 2— Passage Narrator (voice)
1991Horror of the Hungry Humongous Hungan— Opening Narration (voice)
1988Outlaw of Gor— Xeno
1988Genç Silahşörler— L. G. Murphy
1988Imagine: John Lennon— Self
1987Bağdat Cafe— Rudi Cox
1987Gor— Xenos
1985Night of 100 Stars II— Self
1985George Stevens: A Filmmaker's Journey— (archive footage)
1983Hollywood Out-takes and Rare Footage— Self (archive footage) (uncredited)
1982The Helm of Destiny— Narration
1982Psychic Confession— Narrator
1982Alone in the Dark— Frank Hawkes
1981Evil Stalks This House— Stokes
1980Shirli Kılıç— Voltan
1980Without Warning— Joe Taylor
1980The Ivory Ape— Marc Kazarian
1980The Golden Moment: An Olympic Love Story— Whitey Robinson
1979The Shape of Things to Come— Omus
1979Portrait of a Hitman— Jim Buck
1979Cocaine Cowboys— Raphael
1979The Last Ride of the Dalton Gang— Will Smith
1979Buck Rogers in the 25th Century: Planet of the Slave Girls— Kaleel
1978The One Man Jury— Lieutenant Wade
1978Unknown Powers— Himself - Host
1977The Unknown Force— Self - Host
1977Welcome to Blood City— Frendlander
1977National Geographic: The Volga— Narrator (voice)
1977Kolossal - I magnifici Macisti
1976Eva nera— Judas Carmichael
1976Squadra antiscippo— Norman Shelley / Richard J. Russo
1976I padroni della città— Scarface' Manzari
1976Diamante Lobo— Sam Clayton
1976Safari Express— van Daalen
1976Sangue di sbirro— Duke
1975Duyarlı Hemşire— Mr. Kitch
1975The Four Deuces— Vic Morono, the Boss
1975Africa Express— Robert Preston / Willaim Hunter
1975Il richiamo del lupo— William Bates
1975The Hatfields and the McCoys— Devil Anse Hatfield
1975Rickles
1974Dracula— Dracula
1974Craze— Neal Mottram
1974The Godchild— Rourke
1973Oklahoma Crude— Hellman
1973Blu Gang e vissero per sempre felici e ammazzati— Hillman
1972Çato: Devlerin Ülkesi— Quincey Whitmore
1972Si può fare… amigo— Sonny Bronston
1972Tedeum— Buck Santini
1972Imagine— Self
1971The Horsemen— Tursen
1970Vamos a matar, compañeros— John
1970Monte Walsh— Chet Rollins
1970The McMasters— Kolby
1969Che!— Fidel Castro
1969The Desperados— Parson Josiah Galt
1969Marquis de Sade: Justine— Antonin
1969La legione dei dannati— Charley MacPherson
1969Hora cero: Operación Rommel— Major John Heston
1968The Strange Case of Dr. Jekyll and Mr. Hyde— Dr. Jekyll / Mr.Hyde
1968Profesyonel Silah— Ricciolo ("Curly")
1968Las Vegas: 500 millones— Douglas
1968Un dollaro per 7 vigliacchi— Matteo Cirini (voice) (uncredited)
1967Torture Garden— Ronald Wyatt (segment 4 "The Man Who Collected Poe")
1967Kill a Dragon— Rick Masters
1967The Spy in the Green Hat— Louis Strago
1967And Still Champion! The Story of Archie Moore— Narrator (voice)
1967Cinéastes de notre temps : Le Dinosaure et le Bébé, dialogue en huit parties entre Fritz Lang et Jean-Luc Godard— Jeremy Prokosch (archive footage)
1966Profesyoneller— Jesus Raza
1966Alice Through the Looking Glass— Jabberwock
1965Once a Thief— Walter Pedak
1964Paparazzi— Self
1964Le Parti des choses : Bardot et Godard— Self
1963Nefret— Jeremy Prokosch
1962La guerra continua— Jack
1962Il Criminale— Herr Bauer / Schneider
1961Barabbas— Torvald
1961Il giudizio universale— Matteoni
1961I mongoli— Ogataï
1961Rosmunda e Alboino— Alboino
1960Austerlitz— Gen. Weirother
1960The Barbarians— Revak
1959Ten Seconds to Hell— Eric Koertner
1959Flor de mayo— Jim Gatsby
1958The Man Inside— Milo March
1957The Lonely Man— Jacob Wade
1957House of Numbers— Arnie Judlow / Bill Judlow
1957The Death of Manolete— Manolete
1957The Last Tycoon— Monroe Stahr
1956Attack— Joe Costa
1956Requiem for a Heavyweight— Harlan 'Mountain' McClintock
1955I Died a Thousand Times— Roy Earle / Roy Collins
1955The Big Knife— Charles Castle
1955Kiss of Fire— El Tigre
1954The Silver Chalice— Simon The Magician
1954Sign of the Pagan— Attila
1953Second Chance— Cappy Gordon
1953Arrowhead— Toriano
1953Flight to Tangier— Gil Walker
1952Sudden Fear— Lester Blaine
1951Halls of Montezuma— Pigeon Lane
1950Panic in the Streets— Blackie
—New Line: Independent Legacies— Self (archive footage)
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