| Movie | 1998 | Patch Adams | Dr. Titan | |
| Movie | 2004 | Broadway's Lost Treasures II | Don Quixote (segment "Man Of La Mancha") | |
| Movie | 1952 | The Sniper | James G. Kent | |
| Movie | 1951 | The Mob | Tom Clancy | |
| Movie | 1955 | Blackboard Jungle | Joshua Y. Edwards | |
| Movie | 1996 | Phenomenon | Dr. Wellin | |
| Movie | 1953 | Pickup on South Street | Joey | |
| Movie | 1955 | The Phenix City Story | John Patterson | |
| Movie | 1974 | The Little Prince | The Pilot | |
| Movie | 1977 | Looking for Mr. Goodbar | Mr. Dunn | |
| Movie | 1993 | The Visual Bible: Matthew | Matthew | |
| Movie | 1981 | Endless Love | Arthur | |
| Movie | 1970 | a.k.a. Cassius Clay | Self | |
| Movie | 1985 | The Bad Seed | Richard Bravo | |
| Movie | 1957 | Spanish Affair | Merritt Blake | |
| Movie | 1991 | Separate But Equal | Chief Justice Earl Warren | |
| Movie | 1995 | Darryl F. Zanuck: 20th Century Filmmaker | Narrator | |
| Movie | 1991 | National Geographic: Splendid Stones | Narrator | |
| Movie | 1990 | Gunsmoke: The Last Apache | Chalk Brighton | |
| Movie | 1999 | Blue Moon | Jimmy Keating | |
| Movie | 1985 | The Canterville Ghost | Sir Simon De Canterville | |
| Movie | 1952 | Eight Iron Men | Pvt. Coke | |
| Movie | 1955 | Patterns | Fred Staples | |
| Movie | 1987 | Lions of the African Night | | |
| Movie | 1985 | Ballad of the Irish Horse | Narrator (voice) | |
| Movie | 1969 | Pendulum | Woodrow Wilson King | |
| Movie | 2002 | The Men Who Made the Movies: Samuel Fuller | Joey (archive footage) | |
| Movie | 1989 | The Final Days | J. Fred Buzhardt | |
| Movie | 1985 | Do You Remember Love | George Hollis | |
| Movie | 2001 | Heroes of Horror | Narrator | |
| Movie | 1997 | Audrey Hepburn: The Fairest Lady | Narrator | |
| Movie | 1988 | Australia's Aborigines | Narrator | |
| Movie | 1972 | Jigsaw | DA Dan Bellington | |
| Movie | 1988 | National Geographic: White Wolf | Narrator (voice) | |
| Movie | 1997 | Wolves at Our Door | Narrator | |
| Movie | 1991 | Absolute Strangers | Dr. RJ Cannon | |
| Movie | 1971 | Murder Once Removed | Frank Manning | |
| Movie | 1988 | Cary Grant: A Celebration of a Leading Man | Narrator | |
| Movie | 1987 | Grace Kelly: The American Princess | Narrator (voice) | |
| Movie | 1986 | The Adventures of Huckleberry Finn | Col. Grangerford | |
| Movie | 1997 | Henry Fonda: Hollywood's Quiet Hero | Self | |
| Movie | 1997 | Tigers of the Snow | Narrator (voice) | |
| Movie | 1993 | Jurassic Park | Jurassic Park Tour Voice (voice) | |
| Movie | 1994 | A Passion for Justice: The Hazel Brannon Smith Story | Earl Clayburn | |
| Movie | 1986 | Howard the Duck | The Cosmos (voice) | |
| Movie | 1995 | 30 Years of National Geographic Specials | Self - Narrator | |
| Movie | 1971 | All the Way Home | Jay Follet | |
| Movie | 1980 | Angel on My Shoulder | Nick | |
| Movie | 1988 | My First Love | Sam Morrissey | |
| Movie | 1970 | The Ceremony of Innocence | King Ethelred | |
| Movie | 1997 | The Sonoran Desert: A Violent Eden | Narrator (voice) | |
| Movie | 1997 | Vincent Price: The Versatile Villain | Narrator | |
| Movie | 1958 | The Power of the Resurrection | Peter | |
| Movie | 1995 | Secrets | Dr. Will Berter | |
| Movie | 1996 | Peter Lorre: The Master of Menace | Self - Narrator (voice) | |
| Movie | 1996 | The Rockford Files: Punishment and Crime | Frank Dougherty | |
| Movie | 1992 | Mastergate | Archer Bowman | |
| Movie | 1979 | The New Media Bible: The Gospel According to St. Luke | Narrator/St. Luke | |
| Movie | 1971 | Incident in San Francisco | Robert Harmon | |
| Movie | 1969 | Night Gallery | SS-Gruppenführer Helmut Arndt / Josef Strobe | |
| Movie | 1975 | Friendly Persuasion | Jess Birdwell | |
| Movie | 1987 | Treasures From The Past | Himself - Narrator | |
| Movie | 1981 | Isabel's Choice | Lyman Jones | |
| Movie | 1998 | The Gates of Jerusalem: A History of the Holy City | Host | |
| Movie | 1982 | Pray TV | Rev. Gus Keiffer | |
| Movie | 1992 | Giant Bears of Kodiak Island | Narrator | |
| Movie | 2003 | Hugh Hefner: American Playboy | Narrator (voice) | |
| Movie | 1990 | Aladdin | The Magician | |
| Movie | 1992 | Mysteries Underground | Self - Narrator | |
| Movie | 1996 | Mary & Tim | Ron Melville | |
| Movie | 1981 | Golden Gate | Thomas J. Kingsley | |
| Movie | 1995 | Lon Chaney: Son of a Thousand Faces | Narrator | |
| Movie | 1981 | Some Call Them ... Freaks | Host (Self) | |
| Movie | N/A | National Geographic's Rain Forest | Self - Narrator | |
| Movie | 1982 | Night of 100 Stars | Self | |
| Movie | 1988 | Australia's Twilight Of The Dreamtime | Narrator | |
| Movie | 1976 | The Macahans | Timothy Macahan | |
| Movie | 1989 | To The Limit | Narrator | |
| Movie | 1997 | Time to Say Goodbye? | Dr. Gerald Klooster | |
| TV Show | 1963 | The Great Adventure | Col. Edwin L. Drake | 1 |
| TV Show | 1967 | Garrison's Gorillas | | 2 |
| TV Show | 1971 | Columbo | Mark Halperin | 1 |
| TV Show | 1961 | Cain's Hundred | Doug Crawford | 1 |
| TV Show | 1997 | Ally McBeal | Seymore Little | 1 |
| TV Show | 1963 | Kraft Suspense Theatre | Lou Franklin | 1 |
| TV Show | 1965 | The F.B.I. | John Streyer | 1 |
| TV Show | 1985 | The Twilight Zone | Sir Lancelot du Lac (segment "The Last Defender of Camelot") | 1 |
| TV Show | 1982 | Hotel | Matt Carmichael | 1 |
| TV Show | 1968 | The Mod Squad | Vincent Warren | 1 |
| TV Show | 1955 | Gunsmoke | Lewis Stark | 1 |
| TV Show | 1948 | Studio One | Joe | 1 |
| TV Show | 1953 | General Electric Theater | | 1 |
| TV Show | 1971 | Cannon | | 1 |
| TV Show | 1994 | Christy | Dr. Ferrand | 2 |
| TV Show | 1951 | Hallmark Hall of Fame | Jay Follet | 1 |
| TV Show | 1955 | Alfred Hitchcock Presents | Harry Adams | 1 |
| TV Show | 1950 | Lux Video Theatre | Dan | 1 |
| TV Show | 1954 | Climax! | Charley Kincaid | 1 |
| TV Show | 1967 | Judd for the Defense | | 2 |
| TV Show | 1969 | The New People | | 1 |
| TV Show | 1987 | A Year in the Life | Joe Gardner | 22 |
| TV Show | 1983 | The Thorn Birds | Paddy Cleary | 4 |
| TV Show | 1961 | Ben Casey | | 1 |
| TV Show | 1949 | Suspense | | 3 |
| TV Show | 1950 | Robert Montgomery Presents | | 2 |
| TV Show | 1951 | Tales of Tomorrow | | 1 |
| TV Show | 1975 | Medical Story | | 1 |
| TV Show | 1956 | The Steve Allen Show | Self - Singer | 1 |
| TV Show | 1994 | Mysteries of the Bible | | 45 |
| TV Show | 1983 | Natural World | Self - Narrator | 1 |
| TV Show | 1961 | Dr. Kildare | Fred Carroll | 1 |
| TV Show | 1984 | George Washington | George Mason | 3 |
| TV Show | 1961 | The Defenders | George Helber | 1 |
| TV Show | 1995 | The Great Defender | | 8 |
| TV Show | 1961 | The Defenders | Acting Governor White | 1 |
| TV Show | 1961 | The Defenders | Harvey Slaughter | 1 |
| TV Show | 1977 | The Andros Targets | Rev. Ellis | 2 |
| TV Show | 1950 | The Web | | 61 |
| TV Show | 1986 | Planet Earth | Narrator | 7 |
| TV Show | 1986 | If Tomorrow Comes | Gunther Hartog | 3 |
| TV Show | 1970 | Night Gallery | Ralph Burke | 1 |
| TV Show | 1991 | Separate but Equal | Chief Justice Earl Warren | 2 |
| TV Show | 1965 | The F.B.I. | Dr. Herbert Barth | 1 |
| TV Show | 1965 | The F.B.I. | Frederic Oliver Scott | 1 |
| TV Show | 1955 | Gunsmoke | Tom Lynott | 1 |
| TV Show | 1955 | Gunsmoke | Bohannan | 1 |
| TV Show | 1955 | Gunsmoke | Will Stambridge | 1 |
| TV Show | 1968 | Hawaii Five-O | Sam Patton | 1 |
| TV Show | 1947 | Kraft Television Theatre | | 10 |
| TV Show | 1948 | The Ed Sullivan Show | Self | 1 |
| TV Show | 1999 | Searching for Lost Worlds | narrator | 5 |
| TV Show | 1985 | A.D. | Claudius | 5 |
| TV Show | 1986 | A Year in the Life | Joe Gardner | 3 |
| TV Show | 1948 | Studio One | Edward Dean | 1 |
| TV Show | 1948 | Studio One | Fred Baxter | 1 |
| TV Show | 1948 | Studio One | | 2 |
| TV Show | 1948 | Studio One | Jim Colton | 1 |
| TV Show | 1948 | Studio One | Calvin | 1 |
| TV Show | 1948 | Studio One | Julian Hurst | 1 |
| TV Show | 1948 | Studio One | Ralph Johnson | 1 |
| TV Show | 1948 | Studio One | Merrick | 1 |
| TV Show | 1965 | National Geographic Specials | Narrator | 2 |
| TV Show | 1993 | Star Trek: Deep Space Nine | Seyetik | 1 |
| TV Show | 1967 | The Carol Burnett Show | Self | 1 |
| TV Show | 1969 | Medical Center | Dr. Thomas Patton | 1 |
| TV Show | 1956 | Tony Awards | Self - Performer | 2 |
| TV Show | 1949 | Suspense | Webb Wilson | 1 |
| TV Show | 1968 | The Dick Cavett Show | Self - Guest | 1 |
| TV Show | 1968 | The Name of the Game | Arlen McKittrick | 1 |
| TV Show | 1962 | The Alfred Hitchcock Hour | Jim Derry | 1 |
| TV Show | 1971 | Great Performances | Self | 2 |
| TV Show | 1956 | Tony Awards | Self - Presenter | 1 |
| TV Show | 1956 | Tony Awards | Self - Winner | 1 |
| TV Show | 1968 | The Name of the Game | Dr. Judson Strode | 1 |
| TV Show | 1944 | Golden Globe Awards | Self - Nominee | 1 |
| TV Show | 1971 | Great Performances | Introduction Narrator (voice) (uncredited) | 1 |
| TV Show | 1967 | The Danny Thomas Hour | | 1 |
| TV Show | 1961 | The Mike Douglas Show | Self | 3 |
| TV Show | 1959 | Bonanza | Sheriff Gideon Yates | 1 |
| TV Show | 1953 | Kraft Television Theatre | | 1 |
| TV Show | 1953 | Medallion Theatre | | 3 |
| TV Show | 1953 | Revlon Mirror Theatre | | 1 |
| TV Show | 1952 | Omnibus | | 1 |
| TV Show | 1952 | Omnibus | Actor | 1 |
| TV Show | 1952 | Omnibus | The Prosecuting Attorney | 1 |
| TV Show | 1952 | The Ford Television Theatre | Walter Crandall | 1 |
| TV Show | 1947 | Kraft Television Theatre | Fred Staples | 2 |
| TV Show | 1947 | Kraft Television Theatre | Frederick Banting | 1 |
| TV Show | 1947 | Kraft Television Theatre | Artaban | 1 |
| TV Show | 1947 | Kraft Television Theatre | Hacker | 1 |
| TV Show | 1948 | Studio One | Richard Baker | 1 |
| TV Show | 1950 | Danger | | 1 |
