Peter MacNicol
- Home Delivery
2026 Howard Evans
- Shell
2025 Dr. Thaddeus Brand
- All's Fair
2025 Robert DeLancie
- The Day the Earth Blew Up: A Looney Tunes Movie
2024 The Invader (voice)
- Our (Almost Completely True) Love Story
2023 Psycho Date
- All Rise
2019 Albert Campbell
- A Series of Unfortunate Events
2017 Ishmael
- Rapunzel's Tangled Adventure
2017 Nigel the Advisor (voice)
- CSI: Cyber
2015 Simon Sifter
- Star Wars Rebels
2014 Tseebo (voice)
- Scooby-Doo! Stage Fright
2013 Dewey Ottman (voices)
- Marvel's Agents of S.H.I.E.L.D.
2013 Professor Elliott Randolph
- Game Change
2012 Rick Davis
- Battleship
2012 Secretary of Defense
- The Mindy Project
2012 Rabbi Adler
- Doc McStuffins
2012 Egghead (voice)
- Veep
2012 Jeff Kane
- Fairly Legal
2011 Judge Smollet
- Young Justice
2010 Professor Ivo / M.O.N.Q.I. (voice)
- G.I. Joe: Renegades
2010 Firefly (voice)
- Ben 10: Ultimate Alien
2010 Oliver / Forever Knight #1 (voice)
- The Spectacular Spider-Man: Attack of the Lizard
2008 Otto Octavius/Doctor Octopus (voice)
- The Spectacular Spider-Man
2008 Otto Octavius (voice)
- The Big Bang Theory
2007 Robert Wolcott
- Stuart Little 3: Call of the Wild
2005 Troopmaster (voice)
- Numb3rs
2005 Writer
- American Dad!
2005 Old Man Hanson (voice)
- Grey's Anatomy
2005 Robert Stark
- Breakin' All the Rules
2004 Philip Gascon
- Danny Phantom
2004 Sidney Poindexter (voice)
- Boston Legal
2004 Dr. Sydney Field
- Justice League Unlimited
2004 David Clinton (voice)
- The Batman
2004 Langstrom (voice)
- The Lyon's Den
2003
- Balto: Wolf Quest
2002 Muru (voice)
- Recess: School's Out
2001 Fenwick (voice)
- 24
2001 Tom Lennox
- The Pooch and the Pauper
2000 Liberty (voice)
- Buzz Lightyear of Star Command
2000 Major (voice)
- Boston Public
2000 Director
- The Secret of NIMH 2: Timmy to the Rescue
1999 Narrator (voice)
- Baby Geniuses
1999 Dan
- Olive, the Other Reindeer
1999 Fido (voice)
- Snowden's Christmas
1999 Snowden (voice)
- Silencing Mary
1998 Lawrence Dixon
- The Wild Thornberrys
1998 Raju / Monkey (voice)
- CatDog
1998 Runt (voice)
- Bean
1997 David Langley
- Ally McBeal
1997 Director
- Mojave Moon
1996 Tire Repairman
- Abducted: A Father's Love
1996 Roy Dowd
- TFI Friday
1996
- Dracula: Dead and Loving It
1995 Thomas Renfield
- Roswell
1994 Lewis Rickett
- Radioland Murders
1994 Son Writer
- Chicago Hope
1994 Alan Birch
- Addams Family Values
1993 Gary Granger
- Housesitter
1992 Marty
- Hard Promises
1992 Stuart
- The Powers That Be
1992 Bradley Grist
- By Dawn's Early Light
1990 Sedgwick
- Ghostbusters II
1989 Janosz Poha
- American Blue Note
1989 Jack Solow
- Tales from the Crypt
1989 Austin Haggard (segment "Let the Punishment Fit the Crime")
- Voices & Visions: Walt Whitman
1988 Narrator
- The Days and Nights of Molly Dodd
1987 Steve Cooper
- Heat
1986 Cyrus Kinnick
- Johnny Bull
1986 Joe Kovacs
- Sophie's Choice
1982 Stingo
- Faerie Tale Theatre
1982 Martin
- Cheers
1982 Mario
- Dragonslayer
1981 Galen
- Floss
Dr. Rivus
