| 2024 | Elizabeth Taylor: Las cintas perdidas | Self (archive footage) |
| 2001 | The Return of Captain Sinbad | Narrator |
| 2000 | Backstory: 'How Green Was My Valley' | Self (archive footage) |
| 2000 | Mary Pickford: A Life on Film | Self |
| 1999 | Linda Darnell: Hollywood's Fallen Angel | — |
| 1999 | Keepers of the Frame | Himself |
| 1998 | Detrás del planeta de los simios | Self - Hosted by (also archive footage) |
| 1998 | Algo en que creer | Gambler |
| 1998 | Louise Brooks: Looking for Lulu | Himself - Actor / Friend |
| 1998 | Star Power: The Creation Of United Artists | Narrator (voice) |
| 1997 | Vincent Price: The Versatile Villain | Self |
| 1997 | Las nuevas aventuras de Batman (serie) | The Mad Hatter / Jervis Tetch (voice) |
| 1997 | Obsesionado con Vértigo - Un nuevo comienzo para la obra maestra de Hitchcock | Narrator (Voice) |
| 1997 | Mowgli y Baloo (El libro de la selva 2) | King Murphy |
| 1997 | Audrey Hepburn: The Fairest Lady | Self |
| 1997 | Twentieth Century Fox: The First 50 Years | Self |
| 1997 | Walter Matthau: Diamond in the Rough | Self |
| 1996 | Unlikely Angel | Saint Peter |
| 1996 | Superman: La serie animada (serie) | Mad Hatter (voice) |
| 1996 | Dead Man's Island | Trevor Dunnaway |
| 1996 | Remember WENN (serie) | Giles Aldwych |
| 1996 | Star Hunter, El Cazador de Estrellas | Riecher |
| 1995 | Pinky y Cerebro (serie) | Snowball (voice) |
| 1995 | Darryl F. Zanuck: 20th Century Filmmaker | Self |
| 1995 | Peligro Alien | Dr. Henry Lazarus |
| 1994 | Gárgolas (serie) | — |
| 1994 | Biography: Bette Davis — If Looks Could Kill | Self |
| 1994 | The Story of Lassie | Self |
| 1994 | Mirror Mirror 2: Raven Dance | Dr. Lasky |
| 1994 | Burke's Law (serie) | Maurice Gillette |
| 1994 | Meet Me in St. Louis: The Making of an American Classic | Narrator (voice) |
| 1993 | SWAT Kats: The Radical Squadron (serie) | — |
| 1993 | The Evil Inside Me | Pauly |
| 1992 | Batman: La Serie Animada (serie) | Mad Hatter (voice) |
| 1992 | MGM: When the Lion Roars (serie) | — |
| 1992 | Double Trouble | Phillip Chamberlin |
| 1992 | Los gusanos no llevan bufanda | Ernest Peabody |
| 1991 | Timmy's Gift: A Precious Moments Christmas | Narrator (voice) |
| 1991 | El principe valiente (serie) | — |
| 1991 | El submarino chiflado | Secretary Neighbor |
| 1991 | Deadly Game | Dr. Aaron |
| 1991 | Crazy About the Movies: Dennis Hopper | Self |
| 1991 | An Inconvenient Woman (serie) | Cyril Rathbone |
| 1991 | Earth Angel | Mr. Tatum |
| 1991 | Los piratas de las aguas negras (serie) | Niddler (voice) |
| 1990 | Shakma | Sorenson |
| 1990 | The Color of Evening | Henry Seaton |
| 1990 | Sigue soñando (serie) | Bob Jeffers |
| 1989 | Harold Lloyd: The Third Genius | Self |
| 1989 | Camp Candy (serie) | — |
| 1989 | The New Lassie (serie) | — |
| 1989 | Nightmare Classics (serie) | Inspector Amos |
| 1989 | Clase sangrienta | Mr. Dante |
| 1989 | A través del tiempo (serie) | Edward St. John V |
| 1988 | Remo Williams: The Prophecy | — |
| 1988 | Noche de miedo II | Peter Vincent |
| 1987 | Un mar de líos | Andrew |
| 1987 | Muerte en el invierno | Mr. Murray |
| 1986 | The Wizard (serie) | — |
| 1986 | Bridges to Cross (serie) | — |
| 1986 | Gobots: La batalla de los Rock Lords | Nuggit (voice) |
| 1986 | Matlock (serie) | — |
| 1985 | Alice in Wonderland (serie) | March Hare |
| 1985 | Noche de miedo | Peter Vincent |
| 1985 | Mujeres de Hollywood (serie) | Jason Swandle |
| 1984 | The Zany Adventures of Robin Hood | Prince John |
| 1983 | Una chica simpática | Manfred Hayes |
| 1982 | Cuentos del Mono de oro (serie) | "Bon Chance" Louie |
| 1982 | Cuentos de las estrellas (serie) | Narrator (voice) |
| 1982 | Hotel (serie) | Anthony Spears |
| 1982 | Curso 1984 | Terry Corrigan |
| 1982 | Twilight Theatre | Self - Host |
| 1982 | Mae West | Rene Valentine |
| 1982 | Muerte bajo el sol | Rex Brewster |
| 1982 | Hollywood’s Children | Self (Narrator) |
| 1982 | The Making of Agatha Christie's 'Evil Under the Sun' | Self / Rex Brewster |
| 1981 | La maldición de la reina dragón | Gillespie |
| 1980 | Farewell to the Planet of the Apes | Galen |
| 1980 | Life, Liberty and Pursuit on the Planet of the Apes | Galen |
| 1980 | Treachery and Greed on the Planet of the Apes | Galen |
| 1980 | The Forgotten City of the Planet of the Apes | Galen |
| 1980 | Back to the Planet of the Apes | Galen |
| 1980 | El retorno del rey | Samwise Gamgee (voice) |
| 1980 | Here's Boomer (serie) | — |
| 1980 | Cronicas Marcianas (serie) | Father Stone |
| 1979 | Tonto el último | Jenkins |
| 1979 | Trapper John, M.D. (serie) | — |
| 1979 | Buck Rogers: El aventurero del espacio (serie) | Governor Saroyan |
| 1979 | Hart to Hart | Dr. Peterson |
| 1979 | Sweepstakes (serie) | — |
| 1978 | Flying High (serie) | — |
| 1978 | El círculo de hierro | White Robe |
| 1978 | El gato que vino del espacio | Mr. Stallwood |
| 1978 | El rayo destructor del planeta desconocido | Doctor Mellon |
| 1978 | Las aventuras del ladrón de Bagdad | Hasan |
| 1977 | Vacaciones en el mar (serie) | Fred Beery |
| 1977 | The Rhinemann Exchange (serie) | Bobby Ballard |
| 1977 | The Fantastic Journey | Dr. Jonathan Willoway |
| 1977 | The Fantastic Journey (serie) | Dr. Jonathan Willoway |
| 1977 | Sixth and Main | Skateboard |
| 1976 | La criatura infernal | Frank Riley |
| 1976 | Mowgli's Brothers | Mowgli (voice) |
| 1975 | Mean Johnny Barrows | Tony Da Vince |
| 1975 | La mujer maravilla (serie) | Henry Roberts |
| 1975 | Ellery Queen (serie) | — |
| 1975 | The White Seal | Narrator/ White Seal |
| 1975 | Funny Lady | Bobby Moore |
| 1975 | Elizabeth Taylor: An Intimate Portrait | Self |
| 1974 | La mujer policia (serie) | Moulton |
| 1974 | Planet of the Apes (serie) | Galen |
| 1974 | Harry O (serie) | — |
| 1974 | Pánico en el ascensor | Marvin Ellis |
| 1973 | The Snoop Sisters (serie) | Lionel Standish |
| 1973 | Miracle on 34th Street | Dr. Sawyer |
| 1973 | Arnold | Robert |
| 1973 | La leyenda de la mansión del infierno | Benjamin Franklin Fischer |
| 1973 | La conquista del planeta de los simios | Caesar |
| 1973 | The American Film Institute Salute to ... (serie) | Self |
| 1973 | Barnaby Jones (serie) | Stanley Lambert |
| 1972 | El juez de la horca | Frank Gass |
| 1972 | La aventura del Poseidón | Acres |
| 1972 | The Rookies (serie) | — |
| 1972 | La rebelión de los simios | Caesar |
| 1971 | What's a Nice Girl Like You...? | Albert Soames |
| 1971 | La Presencia del Diablo | Dr. Michael Lomas |
| 1971 | La bruja novata | Mr. Jelk |
| 1971 | Terror in the Sky | Dr. Ralph Baird |
| 1971 | Colombo (serie) | Roger Stanford |
| 1971 | Huida del planeta de los simios | Cornelius |
| 1971 | Querido profesor | Mr. Proffer |
| 1971 | Great Performances (serie) | Self |
| 1971 | Journey to Murder | Rollo Verdew |
| 1970 | McCloud (serie) | — |
| 1969 | Night Gallery | Jeremy Evans |
| 1969 | Love, American Style (serie) | Howard |
| 1969 | Angel, Angel, Down We Go | Santoro |
| 1969 | Hello Down There | Nate Ashbury |
| 1968 | Journey to the Unknown (serie) | — |
| 1968 | The Name of the Game (serie) | Philip Saxon |
| 1968 | El póker de la muerte | Nick Evers |
| 1968 | El planeta de los simios | Cornelius |
| 1967 | Cricket on the Hearth | Cricket Crocket (voice) |
| 1967 | Saint Joan | Charles, The Dauphin |
| 1967 | The Carol Burnett Show (serie) | Invitado especial |
| 1967 | La estatua viviente | Arthur Pimm |
| 1967 | The Cool Ones | Tony Krum |
| 1967 | Ironside (serie) | — |
| 1967 | Al loro con el oro | Bullwhip Griffin |
| 1967 | Los invasores (serie) | Lloyd Lindstrom |
| 1966 | Misión: imposible (serie) | Leo Ostro |
| 1966 | Felony Squad (serie) | — |
| 1966 | Todo por amor | Alan Musgrave |
| 1966 | Batman (serie) | The Bookworm |
| 1965 | La rebelde | Walter Baines |
| 1965 | Un gato del FBI | Gregory Benson |
| 1965 | Run for Your Life (serie) | Gyula Bognar |
| 1965 | El tercer día | Oliver Parsons |
| 1963 | Kraft Suspense Theatre (serie) | Robert 'Professor' Benson |
| 1963 | La hora de los famosos (serie) | Arthur Biddle |
| 1963 | The Danny Kaye Show (serie) | Self |
| 1963 | Arrest and Trial (serie) | — |
| 1963 | The Power and the Glory | Mestizo |
| 1962 | The Merv Griffin Show (serie) | Self |
| 1962 | The Tonight Show Starring Johnny Carson (serie) | Self |
| 1962 | La hora de Alfred Hitchcock (serie) | Gerald Musgrove |
| 1961 | Ben Casey (serie) | — |
| 1960 | Un grito en la niebla | Malcolm |
| 1960 | The Subterraneans | Yuri Gilgoric |
| 1959 | La dimensión desconocida (serie) | Sam Conrad |
| 1958 | Heart of Darkness | Charles Marlow |
| 1958 | Naked City (serie) | Donnie Benton |
| 1957 | Las cuatro en punto (serie) | — |
| 1955 | Matinee Theater (serie) | — |
| 1953 | General Electric Theater (serie) | Leprechaun |
| 1952 | The Steel Fist | Eric Kardin |
| 1951 | Hallmark Hall of Fame (serie) | The Dauphin |
| 1950 | Lux Video Theatre (serie) | Pete |
| 1950 | Big Timber | Jimmy |
| 1950 | Killer Shark | Ted White |
| 1950 | Robert Montgomery Presents (serie) | Pip |
| 1949 | Black Midnight | Scott Jordan |
| 1949 | Tuna Clipper | Alec MacLennan |
| 1948 | The Ed Sullivan Show (serie) | Self |
| 1947 | Kraft Television Theatre (serie) | — |
| 1946 | Holiday in Mexico | Stanley Owen |
| 1945 | Molly and Me | Jimmy Graham |
| 1945 | Thunderhead - Son of Flicka | Ken McLaughlin |
| 1944 | Las llaves del reino | Francis Chisholm, as a boy |
| 1944 | Las rocas blancas de Dover | John Ashwood II as a Boy |
| 1944 | Premios Globo de Oro (serie) | Self |
| 1943 | Lassie, la cadena invisible | Joe Carraclough |
| 1943 | My Friend Flicka | Ken McLaughlin |
| 1942 | El flautista de Hamelin | Ronnie Cavanaugh |
| 1942 | On the Sunny Side | Hugh Aylesworth |
| 1942 | El hijo de la furia | Benjamin - as a Boy |
| 1941 | Confirm or Deny | Albert Perkins |
| 1941 | ¡Qué verde era mi valle! | Huw Morgan |
| 1941 | El hombre atrapado | Vaner |
