Year | Title | Role | Other notes |
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1973 | Ozzie's Girls | The Candidate | |
1975 | Emergency! | Officer Dave Gordon | Episode: "905-Wild" |
Adam-12 | Officer Gus Corbin | Episode: "Gus Corbin" |
Police Woman | Paul Donin | Episode: "No Place to Hide" |
1976 | Laverne & Shirley | Victor, Jeep Buyer | Episode: "Dating Slump" |
All's Fair | | Episode: "Jealousy" |
Police Woman | Stansky | Episode: "Tender Soldier" |
Delvecchio | Ronnie Striker | Episode: "Hot Spell" |
1977 | Eleanor and Franklin: The White House Years | Robert Dunlap | TV movie Nominated - PrimetimeEmmy Award for Outstanding Supporting Actor – Miniseries or a Movie |
The Hardy Boys/Nancy Drew Mysteries | Chip Garvey | Episode: "Mystery of the Solid Gold Kicker" |
1978 | Sam | Officer Mike Breen | 7 episodes |
Getting Married | Howie Lesser | TV movie |
Little Mo | Norman Brinker | TV movie |
Comes a Horseman | Billy Joe Meynert | |
1978-1979 | Centennial | Captain John McIntosh | 3 episodes |
1979 | Beyond the Poseidon Adventure | Larry Simpson | |
1979-1983 | The Love Boat | Doug Bradbury | 3 episodes |
1979-1980 | 240-Robert | Deputy Dwayne "Thib" Thibideaux | Main character, 13 episodes |
1980 | Flamingo Road | Fielding "Field" Carlyle | TV movie |
The Dream Merchants | Johnny Edge | |
1981 | Goliath Awaits | Peter Cabot | TV movie |
1981-1982 | Flamingo Road | Fielding "Field" Carlyle | Main character, 37 episodes |
1983 | Doctor in Paradise | Tommy | |
1983-1986 | St. Elsewhere | Dr. Robert Caldwell | Main character, 70 episodes |
1984 | Desert Warrior | Gacel Sayah | |
1986 | Prince of Bel Air | Robin Prince | TV movie |
The Deliberate Stranger | Ted Bundy | TV movie Nominated -Golden Globe Award for Best Actor – Miniseries or Television Film |
Let's Get Harry | Harry Burck, Jr. | |
1987 | Moonlighting | Sam Crawford | 4 episodes |
Summer School | Freddy Shoop | |
After the Promise | Elmer Jackson | TV movie Nominated - Golden Globe Award for Best Actor – Miniseries or Television Film |
1988 | The Presidio | Jay Austin | |
Stealing Home | Billy Wyatt | |
1989 | Sweet Bird of Youth | Chance Wayne | TV movie |
Worth Winning | Taylor Worth | |
1990 | Till There Was You | Frank Flynn | |
Kenny Rogers Classic Weekend | Himself | |
1991 | Dillinger | John Dillinger | |
Fourth Story | David Shepard | TV movie |
Long Road Home | Ertie Robertson | TV movie |
Shadow of a Doubt | Uncle Charlie Oakley | |
Cold Heaven | Alex Davenport | |
1991-1993 | Reasonable Doubts | Detective Dicky Cobb | Main character, 45 episodes Nominated - Golden Globe Award for Best Actor – Television Series Drama (1991) Nominated - Golden Globe Award for Best Actor – Television Series Drama (1992) |
1993 | Harts of the West | Rodeo clown | Episode: "The Right Stuff" |
1994 | Natural Born Killers | Uncredited | |
1995 | Original Sins | Johnathan Franye | TV movie |
Magic in the Water | Jack Black | |
The Last Supper | Dominant Male | |
Charlie Grace | Charlie Grace | Main character, 6 episodes |
1996 | Strangers | Mark | Episode: "Visit" |
1996-2000 | Chicago Hope | Dr. Jack McNeil | Main character, 95 episodes Nominated -Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series (1994) Nominated - Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series (1995) Nominated - Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series (1996) Nominated - Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series (1997) |
1997 | Adventures from the Book of Virtues | Ulysses | Episode: "Perseverance" |
Casualties | Tommy Nance | |
The First to Go | Jeremy Hampton | |
1998 | From the Earth to the Moon | Wally Schirra | 2 episodes |
Fear and Loathing in Las Vegas | Magazine Reporter at Mint 400 | |
1999 | I'll Remember April | John Cooper | |
2000 | For All Time | Charles Lattimer | |
The Amati Girls | Lawrence | |
2001 | Crossfire Trail | Bruce Barkow | |
And Never Let Her Go | Thomas Capano | TV movie |
The Legend of Tarzan | Bob Markham (voice) | Episode: "Tarzan and the Outbreak" |
2002 | Local Boys | Jim Wesley | |
The West Wing | Special Agent Simon Donovan | 4 episodes Nominated - Primetime Emmy Award for Outstanding Guest Actor - Drama Series |
2003 | JAG | Special Agent Leroy Jethro Gibbs | 2 episodes (NCIS pilot episodes) |
Freaky Friday | Ryan | |
2003-2021 | NCIS | Special Agent Leroy Jethro Gibbs | Current main character,every episode |
2004 | Chasing Liberty | President James Foster | |
2009 | Weather Girl | Dale | |
2010 | Justice League: Crisis on Two Earths | Superman (voice) | Filming |