Credits

• 2021 · Superstar as Self (archive footage)
• 2015 · Behind Closed Doors with Natalie Morales as Himself (archive footage)
• 2010 · Never Sleep Again: The Elm Street Legacy as Self (archive footage)
• 2006 · Stanley's Dinosaur Round-Up as Great Uncle Stew (voice)
• 2005 · Mr. Thornton Goes to Hollywood as Self (archive footage)
• 2004 · Clifford's Really Big Movie as Clifford the Big Red Dog (voice)
• 2003 · Bad Santa as Bob Chipeska
• 2003 · TV Land Awards: A Celebration of Classic TV as
• 2003 · Manhood as Eli
• 2003 · Time Machine: When Cowboys Were King as Self
• 2003 · The Golden Girls: Lifetime Intimate Portrait Series as Narrator (voice)
• 2002 · 8 Simple Rules... for Dating My Teenage Daughter as Paul Hennessy
• 2002 · Tadpole as Stanley Grubman
• 2002 · Breaking News as
• 2002 · Man of the Year as Bill
• 2002 · Wednesday 9:30 (8:30 Central) as
• 2001 · Nuncrackers as Narrator
• 2001 · Scrubs as Sam Dorian
• 2000 · TV Funhouse as Narrator (voice)
• 2000 · Panic as Josh
• 2000 · Terror Tract as Bob Carter
• 2000 · Clifford the Big Red Dog as
• 2000 · Clifford the Big Red Dog as Clifford the Big Red Dog (voice)
• 2000 · TripFall as Tom Williams
• 2000 · Lost in the Pershing Point Hotel as Christian Therapist
• 1999 · The Early Show as Self
• 1999 · Lethal Vows as David Farris
• 1999 · Law & Order: Special Victims Unit as Dr. Richard Manning
• 1999 · Family Law as Father Andrews
• 1999 · It Came From the Sky as Donald Bridges
• 1999 · Holy Joe as Joe Cass
• 1999 · Batman Beyond as Dr. David Wheeler (voice)
• 1998 · Dead Husbands as Dr. Carter Elston
• 1998 · Bride of Chucky as Chief Warren Kincaid
• 1998 · Loss of Faith as Bruce Simon Barker
• 1998 · Felicity as Mr. Andrew Covington
• 1998 · I Woke Up Early the Day I Died as Robert Forrest
• 1998 · Shadow of Doubt as Steven Mayer
• 1998 · Chance of a Lifetime as Tom Maguire
• 1998 · Montana as Dr. Wexler
• 1997 · Over the Top as Justin
• 1997 · Veronica's Closet as Tim Margolin
• 1997 · Sink or Swim as Hank
• 1997 · Ally McBeal as George Madison
• 1997 · The View as Self
• 1997 · A Gun, a Car, a Blonde as Duncan the Bartender
• 1997 · Nowhere as Moses Helper
• 1997 · Buffy the Vampire Slayer as Self
• 1997 · Buffy the Vampire Slayer as Ted Buchanan
• 1997 · A Child's Wish as Ed Chandler
• 1997 · King of the Hill as Eugene Grandy (voice)
• 1996 · For Hope as Date #5 (uncredited)
• 1996 · Mercenary as Jonas Ambler
• 1996 · Sling Blade as Vaughan Cunningham
• 1996 · E! True Hollywood Story as
• 1996 · Harry Anderson: The Tricks of His Trade as Self
• 1996 · Unforgivable as Paul Hegstrom
• 1996 · Sex, Censorship and the Silver Screen as Quote Reader
• 1995 · The Colony as Rick Knowlton
• 1995 · Gramps as Clarke MacGruder
• 1995 · NewsRadio as Frank Westford
• 1994 · Touched by an Angel as Mike O'Conner
• 1994 · Touched by an Angel as Sheriff Tom McKinsley
• 1994 · Chicago Hope as
• 1994 · North as Ward Nelson
• 1993 · The Only Way Out as Jeremy Carlisle
• 1993 · Intimate Portrait as Self - Interviewee
• 1993 · Intimate Portrait as Self - Narrator (voice)
• 1993 · Dave's World as John Ritter
• 1993 · Late Night with Conan O'Brien as Self - Guest
• 1993 · Heartbeat as Bill Grant
• 1992 · Hearts Afire as John Hartman
• 1992 · The Larry Sanders Show as John Ritter
• 1992 · Stay Tuned as Roy Knable
• 1992 · Noises Off... as Garry Lejeune / Roger Tramplemain
• 1992 · Fish Police as
• 1992 · The Making of High Noon as Self
• 1992 · Martin & Lewis: Their Golden Age of Comedy as Self
• 1992 · The Martin & Lewis Story: The Last Great Comedy Team as Self
• 1991 · The Real Story of O Christmas Tree as Piney (voice)
• 1991 · Problem Child 2 as Ben Healy
• 1991 · The Summer My Father Grew Up as Paul
• 1990 · The Dreamer of Oz as L. Frank Baum
• 1990 · It as Ben Hanscom
• 1990 · Problem Child as Ben
• 1990 · Wings as Stuart Davenport
• 1989 · My Brother's Wife as Barney
• 1989 · Anything But Love as Patrick Serreau
• 1989 · Skin Deep as Zach
• 1988 · Tricks of the Trade as Donald Todsen (uncredited)
• 1988 · Mickey's 60th Birthday as Dudley Goode
• 1988 · LIVE with Kelly and Mark as
• 1987 · Real Men as Bob Wilson
• 1987 · Hooperman as Detective Harry Hooperman
• 1987 · Prison for Children as David Royce
• 1987 · The Last Fling as Phillip Reed
• 1986 · A Smoky Mountain Christmas as Judge Harold Benton (uncredited)
• 1986 · Unnatural Causes as Frank Coleman
• 1986 · Life with Lucy as John Ritter
• 1985 · Letting Go as Alex
• 1984 · All Star Party for Lucille Ball as Self
• 1984 · Donald Duck's 50th Birthday as Self
• 1984 · Muppet Babies as
• 1984 · Three's a Crowd as Jack Tripper
• 1984 · The Cosby Show as Ray Evans
• 1984 · Love Thy Neighbor as Danny Loeb
• 1984 · Strong Kids, Safe Kids as Himself
• 1983 · Sunset Limousine as Alan O'Black
• 1983 · Life's Most Embarrassing Moments as Self - Host
• 1982 · In Love with an Older Woman as Robert
• 1982 · Nature as Narrator (voice)
• 1982 · The Fantastic Miss Piggy Show as Self
• 1982 · The Flight of Dragons as Peter Dickinson (voice)
• 1982 · Pray TV as Tom McPherson
• 1981 · They All Laughed as Charles Rutledge
• 1981 · Entertainment Tonight as Self
• 1980 · Wholly Moses as Satan (The Devil)
• 1980 · John Ritter: Being of Sound Mind and Body as Self / Various
• 1980 · The Comeback Kid as Bubba Newman
• 1980 · Hero at Large as Steve Nichols
• 1979 · Americathon as President Chet Roosevelt
• 1979 · Echoes of the Sixties: A Musical Trip as Self - Host
• 1979 · The Ropers as
• 1978 · Robin Williams: Off the Wall as Himself
• 1978 · Leave Yesterday Behind as Paul Stallings
• 1978 · Ringo as Marty Flesh
• 1978 · The Goldie Hawn Special as Self
• 1978 · How to Survive the '70s and Maybe Even Bump Into Happiness as Self
• 1977 · The Love Boat as Dale Riley
• 1977 · Three's Company as Jack Tripper
• 1976 · Nickelodeon as Franklin Frank
• 1975 · The Night That Panicked America as Walter Wingate
• 1975 · Doc as
• 1975 · Starsky & Hutch as Tom Cole
• 1975 · The Prisoner of Second Avenue as Elevator Passenger (uncredited)
• 1975 · The Bob Crane Show as
• 1974 · Petrocelli as John Oleson
• 1974 · Rhoda as
• 1973 · Kojak as Kenny Soames
• 1973 · The Stone Killer as Hart
• 1973 · The Lie as Bauer
• 1972 · The Streets of San Francisco as
• 1972 · M*A*S*H as Private Carter
• 1972 · The Bob Newhart Show as
• 1972 · The Waltons as
• 1972 · The Waltons as Rev. Matthew Fordwick
• 1972 · The Waltons as Rev. Ezekiel L. Henshaw
• 1972 · The Rookies as
• 1972 · The Other as Rider
• 1972 · Evil Roy Slade as Priest (uncredited)
• 1971 · Scandalous John as Wendell
• 1971 · The Barefoot Executive as Roger
• 1971 · Great Performances as Richard
• 1969 · Medical Center as
• 1968 · Hawaii Five-O as Ryan Moore
• 1968 · Hawaii Five-O as Mike Welles
• 1967 · Mannix as
• 1961 · The Mike Douglas Show as Self - Co-Host
• 1961 · The Mike Douglas Show as Self
• 1950 · The Bob Hope Show as Self
• 1944 · Golden Globe Awards as Self - Nominee