| — | Untitled Lani Pixels Project | Grandpa (voice) |
| 2025 | Nobody 2 | David Mansell |
| — | Meteor | Prof. Daniel Lehman |
| — | Amazing Stories: The Movie I | Professor (archive footage) |
| — | The Movers | |
| 2024 | Knuckles | Chief Pachacamac (voice) |
| 2024 | Self Reliance | Dennis Walcott |
| 2024 | Man and Witch: The Dance of a Thousand Steps | The Alchemist |
| 2024 | Guns & Moses | Sol Fassbinder |
| 2023 | La vida de Michael J. Fox | Dr. Emmet L. Brown (archive footage) (uncredited) |
| 2023 | Nandor Fodor and the Talking Mongoose | Dr. Harry Price |
| 2023 | Camp Hideout | Falco |
| 2022 | Noche de sustos | Alex Windsor |
| 2022 | Tankhouse | Buford |
| 2022 | Who Done It: The Clue Documentary | Self (archive footage) |
| 2021 | Nadie | David Mansell |
| 2021 | El bar de las grandes esperanzas | Grandpa Maguire |
| 2021 | Expedición: Regreso al futuro | Self |
| 2021 | Next Stop, Christmas | Ticket Agent/Conductor |
| 2021 | El club de las abejas reina | Arthur Lane |
| 2021 | Senior Moment | Sal Spinelli |
| 2021 | The Center Seat: 55 Years of Star Trek | Self |
| 2021 | King Lear | King Lear |
| 2020 | Reunited Apart | Self |
| 2020 | Stars in the House | Self |
| 2019 | The Mandalorian | Commissioner Helgait |
| 2019 | Dr. Jack & Mr. Nicholson | Self |
| 2019 | The Haunted Swordsman | The Black Monk |
| 2019 | That Guy... Who Was In That Thing 3: Trek Stars | Self |
| 2018 | A.P. Bio | Melvin |
| 2018 | A Million Little Things | Christopher Lloyd |
| 2018 | Los Conners | Lou Vitore |
| 2018 | Sin Limites (Boundaries) | Stanley |
| 2018 | La historia de la ciencia ficción | Self |
| 2018 | Making a Killing | Lloyd Mickey |
| 2018 | ReRUN | George Benson (old) |
| 2017 | Un golpe con estilo | Milton Kupchak |
| 2017 | Musa | Bernard Rauschen |
| 2017 | The Sound | Clinton Jones |
| 2016 | I am not a serial killer | Mr. Crowley |
| 2016 | Por el amor de Spock | Commander Kruge (archive footage) |
| 2016 | Funny or Die presenta: La película del arte de la negociación de Donald Trump | Doc Brown |
| 2016 | Cold Moon | James Redfield |
| 2016 | 50 Years of Star Trek | Self |
| 2016 | Must See TV: An All Star Tribute to James Burrows | Self |
| 2015 | 12 monos | The Missionary |
| 2015 | 12 monos | The Missionary (uncredited) |
| 2015 | 12 monos | Zalmon Shaw / The Missionary |
| 2015 | Back in Time | Self |
| 2015 | Justo a Tiempo para Navidad | Grandpa Bob |
| 2015 | 88 | Cyrus |
| 2015 | Regreso al presente | |
| 2015 | Doc Brown Saves the World | Emmett Brown |
| 2015 | The Boat Builder | Abner |
| 2015 | Keith Lemon's Back t'Future Tribute | Self |
| 2014 | Mil maneras de morder el polvo | Doc Brown |
| 2014 | Sin City: Una dama por la que matar | Kroenig |
| 2014 | Más allá del jardín | The Woodsman (voice) |
| 2014 | Los signos del apocalipsis | Harry Setag |
| 2014 | Lago de Sangre: El ataque de las lampreas asesinas | Mayor Akerman |
| 2014 | La verdadera historia de la ciencia ficción | Himself |
| 2014 | Codigo Pirata:Las aventuras de Mickey Matson | Grandpa Jack |
| 2014 | The One I Wrote For You | Pop |
| 2014 | Buenas noches | Self |
| 2013 | El show de Michael J. Fox | Principal McTavish |
| 2013 | Sid the Science Kid: The Movie | Dr. Bonabodon (voice) |
| 2012 | Piraña 2 (Piraña 3DD) | Mr. Goodman |
| 2012 | Foodfight! | Mr. Clipboard (voice) |
| 2012 | Muertos antes del amanecer | Horus Galloway |
| 2012 | Las Aventuras de Mickey Matson y la conspiración del cabeza de cobre | Grandpa Jack |
| 2012 | The Oogieloves in the Big Balloon Adventure | Lero Sombrero |
| 2012 | La Patrulla Increíble | Professor (voice) |
| 2012 | Dorothy and the Witches of Oz | The Wizard Of Oz |
| 2012 | Excuse Me for Living | Lars |
| 2012 | Last Call | Pete |
| 2012 | Anything but Christmas | Harry |
| 2012 | The Narrative of Victor Karloch | Victor Karloch |
| 2012 | Cadaver | Cadaver |
| 2012 | Say It Ain't Solo | Himself |
| 2011 | Un plan para enamorarse | Dr. George |
| 2011 | The Chateau Meroux | Nathan |
| 2011 | Las brujas de Oz | The Wizard of Oz |
| 2011 | Visiones de un asesinato | Shep |
| 2011 | Il était une fois… Vol au dessus d'un nid de coucou | |
| 2011 | Adventures of Serial Buddies | Dr. Von Gearheart |
| 2010 | Piraña 3D | Mr. Goodman |
| 2010 | The Haunting Hour: La Serie | Grandpa Walt Montgomery |
| 2010 | Hombres de nieve | The Caretaker |
| 2010 | Tales from the Future | Self |
| 2009 | Navidad con los Buddies: En busca de Santa Can | Stan Cruge |
| 2009 | Jack y las judías mágicas | Headmaster |
| 2009 | La amenaza de Casandra | Prof. Daniel Lehman |
| 2009 | Llamada salvaje | 'Grandpa' Bill Hale |
| 2009 | En tiempo de dragones | Tesselink |
| 2009 | Live from Studio Five | Self |
| 2009 | Looking Back to the Future | Self |
| 2009 | The Macabre World of Lavender Williams | Lester (voice) |
| 2008 | Fringe | Roscoe Joyce |
| 2008 | El valiente Despereaux | Hovis (voice) |
| 2008 | Vamos a la Luna | Amos (voice) |
| 2008 | Camelot: Live from Lincoln Center | King Pellinore |
| 2007 | Big Bang | Theodore |
| 2007 | Chuck | Dr. Leo Dreyfus |
| 2007 | Flakes | Willie |
| 2007 | Head Case | Self |
| 2007 | The Alan Titchmarsh Show | Self |
| 2006 | Psych | Martin Kahn |
| 2006 | Valerie en la escalera | Everett Neely |
| 2006 | Un día perfecto | Michael |
| 2006 | Looking Back at the Future | Himself |
| 2005 | Numb3rs | |
| 2005 | Maestros del terror | |
| 2005 | Las chicas malas del valle | Mr. Chauncey |
| 2005 | Stacked | Harold March |
| 2005 | El detective de Arthur Hailey | Anderson in Launderette |
| 2005 | Here Comes Peter Cottontail: The Movie | Seymour S. Sassafras (voice) |
| 2005 | VM Show Vol. 2 | Dr. Emmett Brown (archive footage) (uncredited) |
| 2004 | The Tony Danza Show | Self |
| 2004 | Admissions | Steward Worthy |
| 2004 | Car Crash: The Delorean Story | Himself |
| 2004 | I Dream | Professor Toone |
| 2004 | Clubhouse | Lou Russo |
| 2003 | Navy: Investigación criminal | Joseph Smith |
| 2003 | Temblores | Dr. Cletus Poffenberger |
| 2003 | Merry Christmas Space Case | Narrator (voice) |
| 2003 | The Haunted Lighthouse | Cap'n Jack |
| 2002 | Interestatal 60 | Ray |
| 2002 | ¡Oye, Arnold! La película | Coroner (voice) |
| 2002 | Cyberchase | Hacker (voice) |
| 2002 | Muérete, mi amor | Bruce |
| 2002 | The Big Time | Doc Powers |
| 2001 | Ley y orden: Acción criminal | Carmine |
| 2001 | Amar la vida | Dr. Harvey Kelekian |
| 2001 | When Good Ghouls Go Bad | Uncle Fred Walker |
| 2001 | On The Edge | Attorney Bum (segment "Happy Birthday") |
| 2001 | Kids World | Leo |
| 2001 | Chasing Destiny | Jet James |
| 2001 | Space Case | Narrator (voice) |
| 2000 | Malcolm | Walter |
| 2000 | Ed | Burt Kiffle |
| 2000 | Convergence | Morley Allen |
| 1999 | Man on the Moon | Self (uncredited) |
| 1999 | El ala oeste de la Casa Blanca | Professor Lawrence Lessig |
| 1999 | Unos peques geniales | Heep |
| 1999 | Alicia en el País de las Maravillas | White Knight |
| 1999 | Mi marciano favorito | Uncle Martin |
| 1999 | It Came From the Sky | Jarvis Moody |
| 1999 | The Emperor's Treasure | Lord Imaru (voice) |
| 1998 | Una rubia auténtica | Ernst |
| 1998 | Las aventuras de Tom Sawyer | Judge Thatcher (voice) |
| 1998 | The Ransom of Red Chief | Sam Howard |
| 1997 | Anastasia | Rasputin (voice) |
| 1997 | El rey de la colina | Smitty (voice) |
| 1997 | Quicksilver Highway | Aaron Quicksilver |
| 1997 | Un ángel en mi equipo | Al |
| 1997 | Dinner at Fred's | Dad |
| 1997 | Cambio de habitos | Theo Teagarden |
| 1997 | Completely Cuckoo | Himself |
| 1996 | Spin City | Owen Kingston |
| 1996 | Spin City | Owen Kingston (archive footage) |
| 1996 | The Right to Remain Silent | Johnny Benjamin |
| 1996 | Cadillac Ranch | Wood Grimes |
| 1995 | Cosas que hacer en Denver cuando estás muerto | Pieces |
| 1995 | Familia de alquiler | Lawrence 'Larry' Kayvey |
| 1995 | Mr. Payback: An Interactive Movie | Ed Jarvis |
| 1995 | Deadly Games | Jordan Kenneth Lloyd |
| 1994 | El Guardián de las Palabras | Mr. Dewey |
| 1994 | Angeles | Al the Angel |
| 1994 | Un campamento en ninguna parte | Dennis Van Welker |
| 1994 | Asesinatos en la radio | Zoltan |
| 1994 | In Search of Dr. Seuss | Mr. Hunch |
| 1994 | The Making of 'The Pagemaster' | Mr. Dewey - Host |
| 1993 | La familia Addams: La tradición continúa | Uncle Fester Addams |
| 1993 | Daniel, el travieso | Switchblade Sam |
| 1993 | El billete | Jimmy |
| 1993 | Fallen Angels | Continental Op |
| 1992 | Dead Ahead: The Exxon Valdez Disaster | Frank Iarossi - Exxon |
| 1992 | T Bone N Weasel | Weasel |
| 1991 | La familia Addams | Uncle Fester |
| 1991 | Suburban Commando | Charlie Wilcox |
| 1991 | Regreso al futuro | Emmett Brown |
| 1990 | Regreso al futuro: Parte III | Emmett Brown |
| 1990 | Patoaventuras: La película - El tesoro de la lámpara perdida | Merlock (voice) |
| 1990 | A mí que me registren | Bruno Daley |
| 1990 | Los secretos de la trilogía de Regreso al Futuro | Dr. Emmett Brown (archive footage) |
| 1990 | The Earth Day Special | Dr. Emmett L. Brown |
| 1989 | Regreso al futuro: Parte II | Emmett Brown |
| 1989 | Los Simpson | Reverend Jim Ignatowski (voice) |
| 1989 | Una pandilla de lunáticos | Henry Sikorsky |
| 1988 | ¿Quién engañó a Roger Rabbit? | Judge Doom |
| 1988 | Ocho hombres | Bill Burns |
| 1988 | Ruta 29 | Henry Henry |
| 1988 | Roger Rabbit and the Secrets of Toon Town | Self |
| 1987 | Una auténtica vida de perros | Reggie Shand / Henry Shand |
| 1987 | Bialy Smok | Jim Martin |
| 1986 | Cuentos asombrosos | R. Beanes |
| 1986 | La aventura más milagrosa jamás contada | Harry |
| 1985 | Regreso al futuro | Emmett Brown |
| 1985 | El juego de la sospecha (Cluedo) | Professor Plum |
| 1985 | Cuentos asombrosos | Professor B.O.Beanes |
| 1985 | El halcón callejero | Anthony Corrido |
| 1984 | Star Trek III: En busca de Spock | Cmdr. Kruge |
| 1984 | Las aventuras de Buckaroo Banzai | John Bigboote |
| 1984 | El gran lío en la universidad | Coach Hindenberg |
| 1984 | Street Hawk: The Movie | Anthony Corrido |
| 1984 | The Cowboy and the Ballerina | |
| 1983 | Las locas peripecias de un Sr. mamá | Larry |
| 1983 | Soy o no soy | Capt. Schultz |
| 1983 | September Gun | Jack Brian |
| 1982 | Cheers | Phillip Semenko |
| 1982 | La gran locura americana | Samuel Starkman ("Municipalians") |
| 1982 | Money on the Side | Sergeant Stampone |
| 1982 | Pilgrim, Farewell | Paul |
| 1981 | El cartero siempre llama dos veces | The Salesman |
| 1981 | La leyenda del llanero solitario | Maj. Bartholomew 'Butch' Cavendish |
| 1981 | Best of the West | The Calico Kid |
| 1980 | Psicópata | Gilbert |
| 1980 | The Black Marble | Arnold's Collector |
| 1980 | Semi-Tough | |
| 1979 | El campo de cebollas | Jailhouse Lawyer |
| 1979 | La dama de rojo | Frognose |
| 1979 | Los primeros golpes de Butch Cassidy y Sundance | Bill Carver |
| 1979 | The Fantastic Seven | Skip Hartman |
| 1978 | Taxi | Reverend Jim Ignatowski |
| 1978 | Taxi | Reverend Jim 'Iggy' Ignatowski |
| 1978 | Camino del sur | Towfield |
| 1978 | The Word | Hans Bogardus |
| 1978 | Lacy and the Mississippi Queen | Jennings |
| 1977 | Otro hombre, otra mujer | Jesse James (uncredited) |
| 1977 | Tres Guerreros | |
| 1975 | Alguien voló sobre el nido del cuco | Max Taber |
| 1975 | Saturday Night Live | Self - Cameo (uncredited) |
| 1975 | Barney Miller | Arnold Scully |
| 1975 | Barney Miller | Vincent Carew |
| 1956 | Premios Tony | Self - Performer (uncredited) |
