Self (archive footage) (uncredited)
Who Done It: The Clue Documentary (2022)
Himself
Life After The Navigator (2020)
For Madmen Only: The Stories of Del Close (2020)
Self
Valerie (2019)
Nick Harper
A Christmas in Vermont (2016)
Vespucci
Wild Oats (2016)
Billy
Silver Skies (2016)
Thank You, Del: The Story of the Del Close Marathon (2015)
Mayor Tommy Gillis
Bigfoot (2012)
Salvation Boulevard (2011)
Uncle Meat
Halloween II (2009)
Mr. Horowitz
Viss par Stīvu (2009)
Gator
The Rocker (2008)
Dr. Berg
Martian Child (2007)
Ben Giamoro
Man About Town (2006)
Fred Nickells
Crazy for Christmas (2005)
narrator
Rockin' at the Red Dog: The Dawn of Psychedelic Rock (2005)
Larry Hertzel
About Schmidt (2002)
Ted Frye
Teddy Bears' Picnic (2002)
The Mesmerist (2002)
Yogi Cook
The Sky is Falling (2001)
David
On the Second Day of Christmas (1997)
Wayne Dreyer
High Stakes (1997)
Blind Man
Gridlock'd (1997)
Det. Caldwell
Out-of-Sync (1995)
Munchie (voice)
Munchie Strikes Back (1994)
Nick Frost
Little Miss Millions (1993)
Taylor Cochran
Lethal Exposure (1993)
Ed Tuttle
Rubin & Ed (1992)
Congressman Calvin Phillips
Quiet Killer (1992)
Mr. Cassidy
Hot Chocolate (1992)
Paul Maggioto
Murder in New Hampshire: The Pamela Wojas Smart Story (1991)
John Ross
Call Me Anna (1990)
Det. Rollings
The Diamond Trap (1988)
Rupert King (segment "Titan Man")
Amazon Women on the Moon (1987)
Jack
Inside Out (1987)
Joseph 'Dutch' Cretzer
Six Against the Rock (1987)
Pinchus Zion
Heat (1986)
King
The Princess Who Had Never Laughed (1986)
Dr. Louis Faraday
Flight of the Navigator (1986)
McBride
My Chauffeur (1986)
The Chief (uncredited)
Clue (1985)
Pete Lassard
Police Academy 2: Their First Assignment (1985)
Carl Lewis
Silence of the Heart (1984)
Jim Osborne
Best Kept Secrets (1984)
Doc
Mister Roberts (1984)
Terry Ladd
This Is Spinal Tap (1984)
Johnny Caravella (Doctor Johnny Fever)
Motown 25: Yesterday, Today, Forever (1983)
Smooth Walker
Doctor Detroit (1983)
Joe Hervey
One Shoe Makes it Murder (1982)
Charles Galloway
Victims (1982)
Snapper
Honky Tonk Freeway (1981)
Lester
Private Lessons (1981)
Koup Trenton
Skyward (1980)
Señor Smooth (voice)
Gridlock (1980)
Dr. Johnny Fever
The Fantastic Funnies (1980)
Self / The Rock Doctor
John Ritter: Being of Sound Mind and Body (1980)
Carnival Worker (uncredited)
The Jerk (1979)
Kip Margolis
Americathon (1979)
Wilbur C. Henderson
You Can't Take it With You (1979)
Outside Chance (1978)
Avery Salminella
More Than Friends (1978)
Ernie Piles, War Correspondent
Loose Shoes (1978)
Roger Dustleman
The Comedy Company (1978)
Bert Stockwell
The Ghost of Flight 401 (1978)
Fred
Tarantulas: The Deadly Cargo (1977)
O'Brien
The Other Side of Midnight (1977)
Jenks
The Amazing Howard Hughes (1977)
Lt. Ted Cantwell
Tail Gunner Joe (1977)
The Big Bus (1976)
Executive
Silent Movie (1976)
Jackson County Jail (1976)
Senator McMannus
Tunnel Vision (1976)
Mr. Walsh, Commerical Director
The Sunshine Boys (1975)
Dr. Gopian
Whiffs (1975)
Prisoners (1975)
Resident
The Blue Knight (1975)
Detective
Hustling (1975)
Red Dog
Shampoo (1975)
The Blue Knight (1973)
Frank Veldini
Steelyard Blues (1973)
Confectionary Man (as Howard Hessman)
Kid Blue (1973)
Santa Rosa bartender
Jory (1973)
Recording Engineer
Cisco Pike (1972)
Last Party Guest
The Christian Licorice Store (1971)
Drama Teacher
Billy Jack (1971)
Bartender
Some Kind of a Nut (1969)
(as Don Sturdy)
A Session with the Committee (1969)
Hippie (uncredited)
Petulia (1968)