Acting

2021

(1 episode) as Self (archive footage)

2015

(1 episode) as Himself (archive footage)

2003

(1 episode)

2002		8 Simple Rules... for Dating My Teenage Daughter (31 episodes) as Paul Hennessy
2002		Breaking News (1 episode)
2002		Wednesday 9:30 (8:30 Central) (1 episode)

2001

(1 episode) as Sam Dorian

2000

(130 episodes) as Clifford the Big Red Dog (voice) (0 episodes)

1999		The Early Show (1 episode) as Self
1999		Family Law (1 episode)
1999		Law & Order: Special Victims Unit (1 episode) as Dr. Richard Manning
1999		Batman Beyond (1 episode) as Dr. David Wheeler (voice)

1998

(7 episodes) as Mr. Andrew Covington

1997		Over the Top (1 episode) as Justin
1997		Ally McBeal (2 episodes) as George Madison
1997		The View (2 episodes) as Self
1997		Buffy the Vampire Slayer (1 episode) as Self (1 episode) as Ted Buchanan
1997		King of the Hill (4 episodes) as Eugene Grandy (voice)

1996

(4 episodes)

1995

(1 episode) as Frank Westford

1994		Touched by an Angel (1 episode) as Sheriff Tom McKinsley (1 episode) as Mike O'Conner
1994		Chicago Hope (1 episode)

1993		Intimate Portrait (1 episode) as Self - Narrator (voice) (1 episode) as Self - Interviewee
1993		Dave's World (2 episodes)
1993		Late Night with Conan O'Brien (1 episode) as Self - Guest

1992		Hearts Afire (54 episodes) as John Hartman
1992		The Larry Sanders Show (1 episode) as John Ritter
1992		Fish Police (6 episodes)
1992		Martin & Lewis: Their Golden Age of Comedy (3 episodes) as Self

1990		It (2 episodes) as Ben Hanscom
1990		Wings (1 episode) as Stuart Davenport

1988

(1 episode)

1987

(42 episodes) as Detective Harry Hooperman

1986

(1 episode) as John Ritter

1984		Muppet Babies (1 episode)
1984		Three's a Crowd (22 episodes) as Jack Tripper
1984		The Cosby Show (1 episode)

1983

(1 episode) as Self - Host

1982

(1 episode) as Narrator (voice)

1981

(1 episode) as Self

1979

(1 episode)

1977		The Love Boat (1 episode) as Dale Riley
1977		Three's Company (171 episodes) as Jack Tripper

1975		Doc (1 episode)
1975		Starsky & Hutch (1 episode) as Tom Cole
1975		The Bob Crane Show (1 episode)

1974		Petrocelli (1 episode) as John Oleson
1974		Rhoda (2 episodes)

1973

(1 episode) as Kenny Soames

1972		The Streets of San Francisco (1 episode)
1972		MAS*H (1 episode) as Private Carter
1972		The Bob Newhart Show (1 episode)
1972		The Waltons (20 episodes)
1972		The Rookies (1 episode)

1971

(1 episode) as Richard

1969

(1 episode)

1968

(1 episode) as Mike Welles (1 episode) as Ryan Moore

1967

(1 episode)

1961

(1 episode) as Self (1 episode) as Self - Co-Host

1950

(1 episode) as Self