Hey Arnold! The Movie (2002) as Coroner
When Good Ghouls Go Bad (2001) as Uncle Fred
Premonition (2000) as Morley Aiken
My Favorite Martian (1999) as Uncle Martin
Baby Geniuses (1999) as Heep
It Came From The Sky (1999) as Jarvis Moody
The Real Blonde (1998) as Ernst
Quicksilver Highway (1998) as Aaron Quicksilver
Changing Habits (1997) as Theo Teagarden
Anastasia (1997) as Rasputin
Cadillac Ranch (1996) as Wood Grimes
Mr. Payback (1995) as Ed Jarvis
Things To Do In Denver When You're Dead (1995) as Pieces
Angels In The Outfield (1994) as Al the Angel
Radioland Murders (1994) as Zoltan
The Pagemaster (1994) as Mr. Dewey/The Pagemaster
Camp Nowhere (1994) as Dennis Van Welker
Twenty Bucks (1993) as Jimmy
Dennis The Menace (1993) as Switchblade Sam
Addams Family Values (1993) as Uncle Fester Addams
Rent-A-Kid (1992) as Lawrence
The Addams Family (1991) as Uncle Fester Addams/Gordon Craven
Legend Of The White Horse (1991) as Jim Martin
Suburban Commando (1991) as Charlie Wilcox
Back To The Future Part III (1990) as Dr. Emmett Brown
Ducktales: The Movie--Treasure Of The Lost Lamp (1990) as Merlock
Why Me? (1990) as Bruno
Back To The Future Part II (1989) as Dr. Emmett Brown
The Dream Team (1989) as Henry Sikorsky
Eight Men Out (1988) as Bill Burns
Who Framed Roger Rabbit (1988) as Judge Doom
Track 29 (1988) as Dr. Henry Henry
Miracles (1987) as Harry
Walk Like A Man (1987) as Reggie Henry
Back to the Future (1985) as Dr. Emmett Brown
Clue (1985) as Prof. Plum
Joy Of Sex (1984) as Coach Hindenberg
The Adventures of Buckaroo Banzai: Across the 8Th Dimension (1984) as John Bigboote
Star Trek III: The Search for Spock (1984) as Kurge
Mr. Mom (1983) as Larry
To Be Or Not To Be (1983) as Capt. Schultz
The Legend Of The Lone Ranger (1981) as Cavendish
The Postman Always Rings Twice (1981) as Salesman
Pilgrim, Farewell (1980) as Paul
Schizoid (1980) as Gilbert
The Lady In Red (1979) as Frognose
The Onion Field (1979) as Jailhouse Lawyer
Butch And Sundance: The Early Days (1979) as Bill Carver
Goin' South (1978) as Towfield
One Flew Over the Cuckoo's Nest (1975) as Taber

A Perfect Day as Michael
American Playhouse as Paul
Back to the Future as Doc Brown
Barney Miller as Carew
Best of the West
Cheers as Phillip Semenko
Clubhouse as Lou Russo
Cyberchase as Hacker
Deadly Games as Sebastian Jackal
King of the Hill as Smitty
Malcolm in the Middle as Walter
Masters of Horror as Everett Neely
Spin City as Owen Joyce
Stacked as Harold March
Taxi as `Reverend Jim' Ignatowski
The Tick as Fishladder
The West Wing as Prof. Lawrence Lessig
Tremors as Cletus