| tv | Everybody's Live with John Mulaney (2025)As Self - Willy Loman, Weston Playhouse, Weston, VT, 2010 (Pre-Tape Segment) | (Not seen) |
| movie | Nobody 2 (2025)As David Mansell | (Not seen) |
| tv | Knuckles (2024)As Chief Pachacamac (voice) | (Not seen) |
| movie | Man and Witch: The Dance of a Thousand Steps (2024)As The Alchemist | (Not seen) |
| movie | Nandor Fodor and the Talking Mongoose (2023)As Dr. Harry Price | (Not seen) |
| movie | Self Reliance (2023)As Dennis Walcott | (Not seen) |
| tv | Wednesday (2022)As Professor Orloff | (Not seen) |
| tv | Hacks (2021)As Larry Arbuckle | (Not seen) |
| movie | Queen Bees (2021)As Arthur Lane | (Not seen) |
| movie | The Tender Bar (2021)As Grandpa | (Not seen) |
| movie | Nobody (2021)As David Mansell | (Not seen) |
| tv | The Uncanny Counter (2020)As Dr. Emmett Brown (archive footage) | (Not seen) |
| tv | The Mandalorian (2019)As Commissioner Helgait | (Not seen) |
| tv | James Cameron's Story of Science Fiction (2018)As Self | (Not seen) |
| tv | A Million Little Things (2018)As Christopher Lloyd | (Not seen) |
| tv | A.P. Bio (2018)As Melvin | (Not seen) |
| movie | Going in Style (2017)As Milton Kupchak | (Not seen) |
| movie | Muse (2017)As Rauschen | (Not seen) |
| movie | The Sound (2017)As Clinton Jones | (Not seen) |
| movie | Cold Moon (2016)As James Redfield | (Not seen) |
| movie | I Am Not a Serial Killer (2016)As Mr. Crowley | (Not seen) |
| tv | 12 Monkeys (2015)As The Missionary | (Not seen) |
| movie | Back in Time (2015)As Self | (Not seen) |
| tv | Over the Garden Wall (2014)As The Woodsman (voice) | (Not seen) |
| movie | Zodiac: Signs of the Apocalypse (2014) (AKA "Apocalypse Tomorrow")As Harry Setag | (Not seen) |
| movie | Blood Lake: Attack of the Killer Lampreys (2014) (AKA "Blood Lake")As Mayor Akerman | (Not seen) |
| movie | Sin City: A Dame to Kill For (2014) (AKA "Sin City 2")As Kroenig | (Not seen) |
| movie | A Million Ways to Die in the West (2014)As Doc Brown (uncredited) | (Not seen) |
| movie | The Oogieloves in the Big Balloon Adventure (2012) (AKA "The Oogieloves in "The BIG Balloon Adventure"")As Lero Sombrero | (Not seen) |
| movie | Dead Before Dawn 3D (2012) (AKA "Dead Before Dawn")As Horus Galloway | (Not seen) |
| movie | Foodfight! (2012)As Mr. Clipboard | (Not seen) |
| movie | Cadaver (2012)As Cadaver | (Not seen) |
| movie | Piranha 3DD (2012) (AKA "Piranha Returns")As Mr. Goodman | (Not seen) |
| movie | InSight (2011) (AKA "Who Killed Allison Parks?")As Shep | (Not seen) |
| movie | Piranha 3D (2010)As Henry Goodman | (Not seen) |
| movie | Santa Buddies (2009)As Stan Cruge | (Not seen) |
| movie | Jack and the Beanstalk (2009)As Headmaster | (Not seen) |
| tv | Knights of Bloodsteel (2009) (AKA "Dragons of Black Roc")As Tesselink | (Not seen) |
| tv | Fringe (2008)As Roscoe Joyce | (Not seen) |
| movie | The Tale of Despereaux (2008)As Hovis (voice) | (Not seen) |
| tv | Chuck (2007)As Dr. Leo Dreyfus | (Not seen) |
| tv | The Big Bang Theory (2007)As Theodore | (Not seen) |
| movie | Fly Me to the Moon 3D (2007) (AKA "Fly Me to the Moon")As Amos (voice) | (Not seen) |
| tv | Psych (2006)As Martin Kahn | (Not seen) |
| movie | "Comedy Central Roasts" Comedy Central Roast of Pamela Anderson (2005) (AKA "Comedy Central Roast of Pamela Anderson") | (Not seen) |
| tv | NCIS (2003)As Joseph Smith | (Not seen) |
| movie | Interstate 60 (2002) (AKA "I-60")As Ray | (Not seen) |
| movie | Wit (2001)As Dr. Harvey Kelekian | (Not seen) |
| tv | Malcolm in the Middle (2000)As Walter | (Not seen) |
| tv | The West Wing (1999)As Professor Lawrence Lessig | (Not seen) |
| movie | Alice in Wonderland (1999)As White Knight | (Not seen) |
| movie | Baby Geniuses (1999)As Heep | (Not seen) |
| movie | Man on the Moon (1999) (AKA "Andy Kaufman")As Christopher Lloyd - 'Taxi' Actor | (Not seen) |
| tv | King of the Hill (1997)As Smitty (voice) | (Not seen) |
| movie | Quicksilver Highway (1997)As Aaron Quicksilver | (Not seen) |
| movie | Angels in the Endzone (1997)As Al the Boss Angel | (Not seen) |
| movie | Anastasia (1997)As Rasputin (voice) | (Not seen) |
| movie | The Real Blonde (1997)As Ernst | (Not seen) |
| movie | Rent-a-Kid (1995)As Lawrence 'Larry' Kayvey | (Not seen) |
| movie | Things to Do in Denver When You're Dead (1995)As Pieces | (Not seen) |
| movie | The Pagemaster (1994)As Mr. Dewey | (Not seen) |
| movie | Radioland Murders (1994)As Zoltan | (Not seen) |
| movie | Camp Nowhere (1994)As Dennis Van Welker | (Not seen) |
| movie | Angels in the Outfield (1994)As Al the Boss Angel | (Not seen) |
| movie | Dennis the Menace (1993) (AKA "Dennis")As Switchblade Sam | (Not seen) |
| movie | Addams Family Values (1993)As Uncle Fester Addams | (Not seen) |
| movie | Suburban Commando (1991)As Charlie Wilcox | (Not seen) |
| movie | The Addams Family (1991)As Uncle Fester | (Not seen) |
| movie | DuckTales the Movie: Treasure of the Lost Lamp (1990) (AKA "DuckTales: The Movie - Treasure of the Lost Lamp")As Merlock | (Not seen) |
| movie | Back to the Future Part III (1990) (AKA "Three")As Doctor Emmett Brown | (Not seen) |
| tv | The Simpsons (1989)As Reverend Jim Ignatowski (voice) | (Not seen) |
| movie | The Dream Team (1989)As Henry Sikorsky | (Not seen) |
| movie | Back to the Future Part II (1989) (AKA "Paradox")As Doctor Emmett Brown | (Not seen) |
| movie | Track 29 (1988)As Henry Henry | (Not seen) |
| movie | Who Framed Roger Rabbit (1988) (AKA "Dead Toons Don't Pay Bills")As Judge Doom | (Not seen) |
| movie | Eight Men Out (1988)As 'Sleepy' Bill Burns | (Not seen) |
| movie | Clue (1985) (AKA "Clue: The Movie")As Professor Plum | (Not seen) |
| movie | Back to the Future (1985)As Dr. Emmett Brown | (Not seen) |
| movie | Star Trek III: The Search for Spock (1984) (AKA "Star Trek III: Return to Genesis")As Cmdr. Kruge | (Not seen) |
| movie | The Adventures of Buckaroo Banzai Across the 8th Dimension (1984) (AKA "The Adventures of Buckaroo Banzai")As John Bigboote | (Not seen) |
| movie | Mr. Mom (1983)As Larry | (Not seen) |
| movie | To Be or Not to Be (1983)As Capt. Schultz | (Not seen) |
| movie | The Postman Always Rings Twice (1981) (AKA "Wenn der Postmann zweimal klingelt")As Salesman | (Not seen) |
| movie | The Onion Field (1979)As Jailhouse Lawyer | (Not seen) |
| movie | The Lady in Red (1979) (AKA "Guns, Sin and Bathtub Gin")As "Frognose" Balducci | (Not seen) |
| movie | Goin' South (1978)As Deputy Towfield | (Not seen) |
| tv | Saturday Night Live (1975)As Self (uncredited) | (Not seen) |
| movie | One Flew Over the Cuckoo's Nest (1975)As Max Taber | (Not seen) |