| Series
| Role
| Episode
| Airdate
|
| Peter Gunn | Roy Davidson | 1x10 - The Man with the Scar | November 24, 1958
|
| The Untouchables (1959) | Denny Brannon | 4x10 - A Fist of Five | December 4, 1962
|
| Gunsmoke | Harry | 8x15 - False Front | December 22, 1962
|
| The Untouchables (1959) | Red Thomas | 4x19 - An Eye for an Eye | February 19, 1963
|
Gunsmoke
(credited as Roy Thinnis)
| Ab | 8x37 - Jeb | May 25, 1963
|
| Twelve O'Clock High | Major Hays | 1x16 - In Search of My Enemy | January 8, 1965
|
| The F.B.I. | Larry Drake | 2x02 - The Escape | October 2, 1966
|
| Twelve O'Clock High | Captain Pridie | 3x05 - A Distant Cry | October 7, 1966
|
| The Fugitive | Carl | 4x08 - Wine Is a Traitor | November 1, 1966
|
| Battlestar Galactica (1978) | Croft | 1x08 - The Gun on Ice Planet Zero (1) | October 22, 1978
|
| Battlestar Galactica (1978) | Croft | 1x09 - The Gun on Ice Planet Zero (2) | October 29, 1978
|
| Supertrain | J.J. Phillips | 1x04 - Hail to the Chief | February 28, 1979
|
| Falcon Crest | Nick Hogan | 2x02 - The Arrival | October 8, 1982
|
| Falcon Crest | Nick Hogan | 2x03 - Troubled Waters | October 15, 1982
|
| Falcon Crest | Nick Hogan | 2x04 - Murder One | October 22, 1982
|
| Falcon Crest | Nick Hogan | 2x05 - The Expose | November 5, 1982
|
| Falcon Crest | Nick Hogan | 2x07 - The Namesake | November 19, 1982
|
| Falcon Crest | Nick Hogan | 2x09 - The Vigil | December 3, 1982
|
| Falcon Crest | Nick Hogan | 2x10 - Confrontations | December 10, 1982
|
| Falcon Crest | Nick Hogan | 2x11 - United We Stand... | December 17, 1982
|
| Falcon Crest | Nick Hogan | 2x12 - ...Divided We Fall | December 31, 1982
|
| Falcon Crest | Nick Hogan | 2x13 - Pas De Deux | January 7, 1983
|
| Falcon Crest | Nick Hogan | 2x14 - Above Suspicion | January 14, 1983
|
| Falcon Crest | Nick Hogan | 2x15 - Broken Promises | January 21, 1983
|
| Falcon Crest | Nick Hogan | 2x16 - Deliberate Disclosure | January 28, 1983
|
| Falcon Crest | Nick Hogan | 2x17 - Love, Honor and Obey | February 4, 1983
|
| Falcon Crest | Nick Hogan | 2x18 - Separate Hearts | February 11, 1983
|
| Falcon Crest | Nick Hogan | 2x19 - The Odyssey | February 18, 1983
|
| Falcon Crest | Nick Hogan | 2x20 - Ultimatums | February 25, 1983
|
| Falcon Crest | Nick Hogan | 2x21 - Maelstrom | March 4, 1983
|
| Falcon Crest | Nick Hogan | 2x22 - Climax | March 11, 1983
|
| Falcon Crest | Nick Hogan | 3x02 - Penumbra | October 7, 1983
|
| Hotel | John White | 1x18 - Memories | February 29, 1984
|
| Murder, She Wrote | Lt.Ted Misko | 2x08 - Dead Heat | November 24, 1985
|
| Highway to Heaven | Howard Sellers | 3x12 - Oh Lucky Man | December 10, 1986
|
| Murder, She Wrote | Sheriff Landry | 4x09 - Trouble in Eden | November 22, 1987
|
| Law & Order | District Attorney Alfred Wentworth | 1x06 - Everybody's Favorite Bagman | October 30, 1990
|
| Murder, She Wrote | J.K. Davern | 7x15 - The Taxman Cometh | February 17, 1991
|
| Walker, Texas Ranger | Colonel Dayton | 3x21 - Case Closed | April 29, 1995
|
| The X-Files | Jeremiah Smith | 3x24 - Talitha Cumi (1) | May 17, 1996
|
| The X-Files | Jeremiah Smith | 4x01 - Herrenvolk (2) | October 4, 1996
|
| Touched by an Angel | Senator Guy Hammond | 3x06 - Secret Service | October 13, 1996
|
| Law & Order | Victor Panatti | 7x23 - Terminal | May 21, 1997
|
| Law & Order | Mr. Kushner | 9x11 - Ramparts | January 13, 1999
|
| The Sopranos | Dr. Baumgartner | 2x11 - House Arrest | March 26, 2000
|
| The X-Files | Jeremiah Smith | 8x14 - This Is Not Happening (1) | February 25, 2001
|
| Law & Order: Criminal Intent | Sheridan Beckworth | 1x04 - The Faithful | October 17, 2001
|
| Oz | Head of Aryan Brotherhood | 5x07 - Good Intentions | February 17, 2002
|
| Law & Order: Special Victims Unit | Curtis Johansen | 3x20 - Greed | April 26, 2002
|
