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| Title | Year | Status | Character |
|---|
| Darkroom | 1981 | TV Series | Dr. John Michaelson |
| The Hot Touch | 1981 | Severo |
| Vega$ | 1978-1981 | TV Series | Alexander Waverly / Mel Blandon / Lyle Galen |
| Hart to Hart | 1980 | TV Series | Frank March |
| Hawaii Five-O | 1970-1980 | TV Series | Israeli Secretary / Colonel Avery / Capt. Roger Newhouse / ... |
| B.J. and the Bear | 1980 | TV Series | Marty Franks |
| Trapper John, M.D. | 1980 | TV Series | Randolph Tiegs |
| The Littlest Hobo | 1979 | TV Series | Mr. Barton |
| Mary and Joseph: A Story of Faith | 1979 | TV Movie | Matthew |
| Charlie's Angels | 1978-1979 | TV Series | Malcolm Case / Jellek |
| The Golden Gate Murders | 1979 | TV Movie | Dr. Hamill |
| The Best Place to Be | 1979 | TV Movie | Bob Stockwood |
| Riel | 1979 | TV Movie | Dr. Schultz |
| Mr. No Legs | 1979 | D'Angelo |
| Battlestar Galactica | 1979 | TV Series | Commandant Leiter |
| A Fire in the Sky | 1978 | TV Movie | Paul Gilliam |
| Greatest Heroes of the Bible | 1978 | TV Series | Imhotep |
| The Immigrants | 1978 | TV Movie | Chris Noel |
| The Amazing Spider-Man | 1978 | TV Series | Dr. Moon |
| The Hardy Boys/Nancy Drew Mysteries | 1978 | TV Series | Dr. Mann |
| The San Pedro Beach Bums | 1977 | TV Series | Baxter |
| The Six Million Dollar Man | 1974-1977 | TV Series | Gordon Shanks / Ulrich Rau / Gavern Wilson |
| The Feather and Father Gang | 1977 | TV Series | Witney |
| Terraces | 1977 | TV Movie | Dr. Roger Cabe |
| McMillan & Wife | 1977 | TV Series | Gregg Patterson |
| The Bionic Woman | 1977 | TV Series | Ivan Kard |
| Most Wanted | 1977 | TV Series | Dr. Simmons |
| Richie Brockelman: The Missing 24 Hours | 1976 | TV Movie | Davenport |
| Executive Suite | 1976 | TV Series | Holland |
| McCloud | 1972-1976 | TV Series | Alfred Donnelly / Jerry Bristol |
| Bronk | 1976 | TV Series | Dr. Spear |
| Collision Course: Truman vs. MacArthur | 1976 | TV Movie | Averell Harriman |
| Switch | 1975 | TV Series | Harmon |
| Barnaby Jones | 1973-1975 | TV Series | Ray Greenwald / John Stevens |
| Ellery Queen | 1975 | TV Series | Col. Alec Nivin |
| Barbary Coast | 1975 | TV Series | Ezra Hubbard |
| It Seemed Like a Good Idea at the Time | 1975 | Burton |
| The Nurse Killer | 1975 | TV Movie | Dr. Holmquist |
| Adams of Eagle Lake | 1975 | TV Series | Kalmus |
| The Rookies | 1975 | TV Series | Giraud |
| The Man in the Glass Booth | 1975 | Dr. Churchill |
| Medical Center | 1969-1974 | TV Series | Todd / Dean Adam Wrightman |
| Rex Harrison Presents Stories of Love | 1974 | TV Movie | David |
| Police Story | 1974 | TV Series | Mayor Langdon |
| Chopper One | 1974 | TV Series | Pike |
| Cannon | 1972-1974 | TV Series | Conrad Akers / Ambrose |
| Gunsmoke | 1974 | TV Series | Burdette |
| The New Perry Mason | 1973 | TV Series | Newton Vance |
| The Magician | 1973 | TV Series | Matt Matthews |
| The Starlost | 1973 | TV Series | Col. M.P. Garoway |
| Satan's School for Girls | 1973 | TV Movie | Delacroix |
| Columbo | 1973 | TV Series | Mazoor Berozski |
| Mannix | 1969-1973 | TV Series | Burt Sands / Alec Ryan |
| Ironside | 1972 | TV Series | Supt. Colin Faber |
| Hec Ramsey | 1972 | TV Series | Myles Wingate |
| Ulzana's Raid | 1972 | Captain Gates |
| Mission: Impossible | 1969-1972 | TV Series | Gen. Oliver Hammond / Mayor Steve Tallman / Maj. Nicholas Zelinko |
| Emergency! | 1972 | TV Series | Dr. Larry Sunderlin |
| Primus | 1972 | TV Series | Derek Simpson |
| The Doris Day Show | 1972 | TV Series | Inspector Stephen Shawcross |
| The Bold Ones: The New Doctors | 1972 | TV Series | Dr. Richard Harkness |
| Norman Corwin Presents | 1972 | TV Series |
| They Call It Murder | 1971 | TV Movie | A.B. Carr |
| The D.A. | 1971 | TV Series | Harold Kyper |
| The Virginian | 1967-1971 | TV Series | Abel Wilks / Luke Evers |
| Crowhaven Farm | 1970 | TV Movie | Kevin Pierce |
| Men at Law | 1970 | TV Series | Phil Kennedy |
| The Silent Force | 1970 | TV Series | Drake |
| It Takes a Thief | 1969-1970 | TV Series | Dr. George Kingsford / Clayton Hewitt |
| Daniel Boone | 1966-1970 | TV Series | Churchill James / Colonel Chalmers / Maksoana / ... |
| The Debbie Reynolds Show | 1970 | TV Series | Lord Farnsworth |
| The Dunwich Horror | 1970 | Dr. Cory |
| Insight | 1966-1970 | TV Series | Announcer / James / Major Bert Hawkins / ... |
| Tiger by the Tail | 1970 | Del Ware |
| The F.B.I. | 1969 | TV Series | Keenyn Gray |
| The Outsider | 1969 | TV Series | George Jenkins |
| Bewitched | 1969 | TV Series | Franklyn Blodgett |
| City Beneath the Sea | 1969 | TV Short | Harmon Temple III |
| The Horse in the Gray Flannel Suit | 1968 | Archer Madison |
| The Name of the Game | 1968 | TV Series | Tom Ramsey |
| Judd for the Defense | 1968 | TV Series | Dr. Stanley Stalling |
| The Young Runaways | 1968 | Raymond Allen |
| Premiere | 1968 | TV Series | Lawrence |
| The Detective | 1968 | Dr. Roberts |
| Tony Rome | 1967 | Vic Rood |
| Custer | 1967 | TV Series | James Stanhope |
| Stranger on the Run | 1967 | TV Movie | Mr. Gorman |
| Hogan's Heroes | 1967 | TV Series | Capt. Roberts / Lt. Baumann |
| The Big Valley | 1967 | TV Series | Joshua Cunningham |
| The Man from U.N.C.L.E. | 1965-1967 | TV Series | Gerald Strothers / Max Van Schreeten |
| Point Blank | 1967 | Frederick Carter |
| Bonanza | 1967 | TV Series | Prince Vladimir |
| Tarzan | 1967 | TV Series | Bergstrom |
| Sail to Glory | 1967 | James Cox Stevens |
| Death Valley Days | 1966 | TV Series | Robert Louis Stevenson |
| The Girl from U.N.C.L.E. | 1966 | TV Series | Sadvaricci / Ole Bergman |
| T.H.E. Cat | 1966 | TV Series | Wallace Lancaster |
| Barefoot in Athens | 1966 | TV Movie | Critias |
| Occasional Wife | 1966 | TV Series | Gordon |
| 12 O'Clock High | 1965-1966 | TV Series | Major Mallory / Kirby Wyatt / Capt. Derek Evans |
| Iron Horse | 1966 | TV Series | John Pendennis |
| The Green Hornet | 1966 | TV Series | Dan Carley |
| Scalplock | 1966 | TV Movie | John Pendennis |
| The Wackiest Ship in the Army | 1966 | TV Series |
| The Wild Wild West | 1966 | TV Series | Zachariah Skull |
| A Man Called Shenandoah | 1965 | TV Series | Murray |
| Branded | 1965 | TV Series | Frank Ross |
| Voyage to the Bottom of the Sea | 1964-1965 | TV Series | Gen. Hobson / Davis |
| Combat! | 1965 | TV Series | Maj. Thorne |
| Honey West | 1965 | TV Series | Guy Patterson |
| The Legend of Jesse James | 1965 | TV Series | Charles Jennings |
| Kraft Suspense Theatre | 1965 | TV Series | Wolfe Hastings |
| Harlow | 1965/II | Marc Peters |
| For the People | 1965 | TV Series | Mark Haviland |
| Bob Hope Presents the Chrysler Theatre | 1964-1965 | TV Series | Cmdr. Brand / Michael Hartley |
| Sylvia | 1965 | Bruce Stamford III |
| The Night Walker | 1964 | The Dream |
| Perry Mason | 1964 | TV Series | Eric Pollard |
| The Lieutenant | 1964 | TV Series | Alexander Denning |
| The Richard Boone Show | 1963-1964 | TV Series | Horace Bartrick / Jacques Cauvine / DA Joe Campbell / ... |
| G.E. True | 1962-1963 | TV Series | Capt. Ian Stuart / Stoughton |
| Drums of Africa | 1963 | David Moore |
| The United States Steel Hour | 1961-1963 | TV Series | Philip / Peter Cochrane / Lord Harton |
| The Dick Powell Theatre | 1962 | TV Series | Col. Juan Valera |
| Playdate | 1961-1962 | TV Series | Pinedus / David Naseby / Chetwynd |
| Alcoa Premiere | 1962 | TV Series | Victor Vass |
| The Eleventh Hour | 1962 | TV Series | Capt. Norman Hobler |
| Sam Benedict | 1962 | TV Series | Judge Bentham |
| Dr. Kildare | 1962 | TV Series | Dr. Harry Nelson |
| Cain's Hundred | 1962 | TV Series | William Hillier |
| Theatre '62 | 1962 | TV Series | Jack Favell |
| Festival | 1962 | TV Series | Duke Ferdinand |
| The Twilight Zone | 1962 | TV Series | Michael Chambers |
| Thriller | 1961 | TV Series | Prof. Harry Langham |
| The Americans | 1961 | TV Series | Lt. Brady |
| Hong Kong | 1960-1961 | TV Series | Chief Inspector Neil Campbell |
| Point of Departure | 1960 | TV Movie | Monsieur Henri |
| R.C.M.P. | 1960 | TV Series | Paul Donnelly |
| Startime | 1960 | TV Series | Archangel |
| Encounter | 1953-1960 | TV Series | Captain Biggars / Prosecuting Attorney / John Holt / ... |
| The Hill | 1960 | TV Movie | The Narrator (voice) |
| The Citadel | 1960 | TV Movie | Freddie Parker |
| The Further Adventures of Ellery Queen | 1959 | TV Series | Philip Maxwell |
| The Family Reunion | 1959 | TV Movie | Harry |
| Folio | 1955-1959 | TV Series | Count de Soria / Don Pedro de Miura / Agathon / ... |
| The Unforeseen | 1959 | TV Series |
| Hudson's Bay | 1959 | TV Series | Bigood |
| Spectrum | 1958 | TV Mini-Series |
| Adventures of the Sea Hawk | 1958 | TV Series | Larry |
| Twelfth Night | 1957 | TV Movie | Duke Orsino |
| First Performance | 1956-1957 | TV Series | Arthur Murphy / Suraj Surabhai |
| Who Destroyed the Earth | 1957 | TV Movie |
| On Camera | 1955-1957 | TV Series | Markheim |
| Star Tonight | 1955 | TV Series |
| Scope | 1955 | TV Series | Hamlet |
| Playbill | 1955 | TV Series | Archduke Rudolph |
| The Wayne & Shuster Show | 1955 | TV Series |
| Ponds Theater | 1954 | TV Series |
| On the Spot | 1953 | TV Series | Host |
| Omnibus | 1953 | TV Series | First Gentleman |
| Medallion Theatre | 1953 | TV Series |
| Kraft Theatre | 1951-1953 | TV Series |
| Studio One in Hollywood | 1950-1952 | TV Series | Magi Who Delivers Myrrh
Prescott
Edgar Linton |
| Lux Video Theatre | 1951 | TV Series | Soldier |
| One Man's Family | 1949 | TV Series | Capt. Nicholas Lacey (1952) |
| The Mapleville Story | 1946 |
| The Commission | 2003 | John J. McCloy |
| Before I Say Goodbye | 2003 | TV Movie | Mac MacDermott |
| Batman: Vengeance | 2001 | Video Game | Mayor Hamilton Hill (voice) |
| The New Batman Adventures | 1997-1998 | TV Series | Mayor Hamilton Hill |
| Legend of the Mummy | 1998 | Abel Trelawny |
| Loyal Opposition | 1998 | President Mark Hayden |
| Lamb Chop's Special Chanukah | 1995 | TV Movie | Lloyd |
| Batman: The Animated Series | 1992-1994 | TV Series | Mayor Hamilton Hill |
| Dr. Quinn, Medicine Woman | 1994 | TV Series | Sen. Eliot Moses |
| Il caso Dozier | 1993 | TV Movie | Gen. Dozier |
| Morning Glory | 1993 | Bob Collins |
| Landslide | 1992 | Bull Matterson |
| Murder, She Wrote | 1986-1992 | TV Series | John Thurston / Jason Richards / Dr. Terence Mayhew |
| Deadly Deception | 1991 |
| Berlin Lady | 1991 | TV Mini-Series | Wilhelm Speer |
| The Naked Gun 2½: The Smell of Fear | 1991 | Baggett |
| The Young Riders | 1990 | TV Series | Jack T. Devlin |
| Avonlea | 1990 | TV Series | Mr. Cameron |
| Who's the Boss? | 1990 | TV Series | Walter |
| Designing Women | 1990 | TV Series | Ansel Pollard |
| Superboy | 1989 | TV Series | The Old Vampire |
| Dick Francis: Blood Sport | 1989 | TV Movie | James Culham Offen |
| Millennium | 1989 | Walters |
| Fine Gold | 1989 | Don Pedro |
| Highway to Heaven | 1989 | TV Series | Trevor Steele |
| The Golden Girls | 1987-1989 | TV Series | Hairdresser / Patrick Vaughn |
| 1st & Ten: The Championship | 1988 | TV Series | Mr. Smears |
| Hotel | 1983-1988 | TV Series | Louis Green / Cameron Wheeler / Bradford Sievers |
| A Mouse, a Mystery and Me | 1987 | TV Movie | Sam Hall |
| Walt Disney's Wonderful World of Color | 1987 | TV Series | Special Agent Vaughn |
| The Love Boat | 1982-1987 | TV Series | George Tillman / Larry Ellis |
| Race for the Bomb | 1987 | TV Mini-Series | Gen. Curtis LeMay |
| Danger Bay | 1986 | TV Series |
| The Fall Guy | 1986 | TV Series | Charles Linney |
| Crystal Heart | 1986 | Frank Newley |
| Crazy Dan | 1986 | TV Movie | Ritter |
| Crazy Like a Fox | 1985 | TV Series |
| The A-Team | 1985 | TV Series | Steffan Shawn |
| Masquerade | 1984 | TV Series | Lassae Bonarc |
| Matt Houston | 1982-1984 | TV Series | Elgin Cody / Scott Neville |
| Fantasy Island | 1978-1984 | TV Series | Earl of Norfolk / Marquis Phillippe de Sade / Maurice Benson |
| Louisiana | 1984 | TV Movie | Adrien Damvillier |
| Manimal | 1983 | TV Series | Jordon |
| The Lonely Lady | 1983 | Walter Thornton |
| Mazes and Monsters | 1982 | TV Movie | Hall |
| Dynasty | 1981-1982 | TV Series | Cecil Colby |