| Movie | 2023 | Mighty Morphin Power Rangers: Once & Always | Alpha (voice) | |
| Movie | 1989 | How I Got Into College | Young Energizer | |
| Movie | 1987 | Summer School | Alan Eakian | |
| Movie | 2021 | Seal Team | Snap (voice) | |
| Movie | 2007 | Hard Four | Sheldon Goldstein | |
| Movie | 2007 | Billy & Mandy's Big Boogey Adventure | Billy / Billybot / Harold / Pale Ghoulish Juror / Chippy the Squirrel (voice) (as Richard Horvitz) | |
| Movie | 1996 | Mighty Morphin Power Rangers Live: The World Tour Live-on-Stage | Alpha 5 (voice) | |
| Movie | 1997 | Turbo: A Power Rangers Movie | Alpha 5 (voice) | |
| Movie | 2005 | Billy and Mandy Save Christmas | Billy (voice) (as Richard Horvitz) | |
| Movie | 1994 | Mighty Morphin Power Rangers: Alpha's Magical Christmas | Alpha 5 (voice) | |
| Movie | 2012 | Ben 10: Destroy All Aliens | Grey Matter | |
| Movie | 2001 | Osmosis Jones | Additional Character Voices (voice) | |
| Movie | 1995 | Get Street Smart: A Kid's Guide to Stranger Dangers | Capricorn (as Richard Stults) | |
| Movie | 2014 | Legends of Oz: Dorothy's Return | Munchkin Suitor (voice) | |
| Movie | 1996 | Power Rangers Zeo: Zeo Quest | Alpha 5 (voice) | |
| Movie | 2011 | Fred & Vinnie | Book Store Autoraph Hound | |
| Movie | 2020 | Green Seas | Writer | |
| Movie | 1999 | Jingle Bells | Cheddar (voice) | |
| Movie | 1995 | Mighty Morphin Power Rangers: The Movie | Alpha 5 (voice) | |
| Movie | 2003 | Billy & Mandy's Jacked-Up Halloween | Billy/Guy (voice) | |
| Movie | 2007 | CN Invaded Part 5: Billy & Mandy Moon the Moon | Billy / Billy's Dad (voice) | |
| Movie | 2008 | Snack Break | Grey Matter | |
| Movie | 2013 | Saving Santa | Orange Haired Elf (voice) | |
| Movie | 2004 | Cartoon Network Christmas: Yuletide Follies | Billy (Voice) | |
| Movie | 2009 | The Informant! | Bob Zaiderman | |
| Movie | 2017 | Meeting MacGuffin | Gormal MacGuffin (voice) | |
| Movie | 2007 | Billy & Mandy: Wrath of the Spider Queen | Billy / Billy's Dad (voice) | |
| Movie | 2019 | Invader Zim: Enter the Florpus | Zim (voice) | |
| Movie | 2007 | The Grim Adventures of the Kids Next Door | Billy / Harold (voice) | |
| Movie | 2008 | Underfist: Halloween Bash | Billy / Harold / Pumpkin / Trick-or-Treater Eater (voice) | |
| Movie | 1996 | Sherman's Way: A Kid's Guide to Coping with Change | Corny | |
| Movie | 2014 | I Know That Voice | Self | |
| Movie | 2001 | Cats & Dogs | Puppy in Barn (voice) | |
| Movie | 2005 | Son of the Mask | Otis (voice) | |
| Movie | 2019 | The Angry Birds Movie 2 | Additional Voices (voice) | |
| Movie | 2007 | Ben 10: Secret of the Omnitrix | Grey Matter / Stinkfly Prisoner (voice) | |
| Movie | 1998 | Sabrina Goes to Rome | Stonehenge (voice) | |
| Movie | 1998 | Mulan | Additional Voices (voice) | |
| Movie | 1994 | Angry Beavers in: "Snowbound" | Daggett Beaver | |
| Movie | 2002 | Snow Dogs | Scooper (voice) (uncredited) | |
| Movie | 2000 | The Grim Adventures of Billy & Mandy: Meet the Reaper | Billy (voice) | |
| Movie | 2011 | Crazy, Stupid, Love. | Lowe's Salesman #3 | |
| Movie | 2021 | Captain Daddy | Billy (voice) | |
| TV Show | 1991 | The Legend of Prince Valiant | | 1 |
| TV Show | 2006 | Squirrel Boy | | 52 |
| TV Show | 2000 | Static Shock | Jimmy Osgood (voice) | 1 |
| TV Show | 1997 | Johnny Bravo | | 1 |
| TV Show | 2001 | Grim & Evil | | 62 |
| TV Show | 2001 | Invader ZIM | Zim (voice) | 46 |
| TV Show | 2002 | Codename: Kids Next Door | | 1 |
| TV Show | 1997 | The Angry Beavers | Daggett (voice) | 123 |
| TV Show | 1997 | Cow and Chicken | | 1 |
| TV Show | 1994 | Babylon 5 | Mark | 1 |
| TV Show | 2005 | Ben 10 | Grey Matter (voice) | 21 |
| TV Show | 2007 | El Tigre: The Adventures of Manny Rivera | | 4 |
| TV Show | 1999 | The Chimp Channel | | 13 |
| TV Show | 1997 | Working | Elevator Passenger | 2 |
| TV Show | 2006 | Shorty McShorts' Shorts | Dudley / Guard (voice) | 1 |
| TV Show | 1993 | Power Rangers | Alpha 5 (voice) | 208 |
| TV Show | 1993 | Power Rangers | Alpha 7 (voice) | 1 |
| TV Show | 1996 | Sabrina, the Teenage Witch | Smaller Chair (voice) | 1 |
| TV Show | 2000 | As Told by Ginger | Mitchey Mekelburg (voice) | 1 |
| TV Show | 1996 | Sabrina, the Teenage Witch | Duck Head (voice) | 1 |
| TV Show | 2001 | The Grim Adventures of Billy and Mandy | Billy (voice) | 184 |
| TV Show | 2016 | Bunnicula | Lugosi (voice) | 65 |
| TV Show | 2015 | Wabbit: A Looney Tunes Production | Imp (voice) | 1 |
| TV Show | 2018 | Little Big Awesome | Pacifier / Jerry / Bear (voice) | 1 |
| TV Show | 2018 | Little Big Awesome | Stevey Murple (voice) | 1 |
| TV Show | 2010 | Fish Hooks | Ninja Fish (voice) | 1 |
| TV Show | 2010 | Fish Hooks | Salmon 2 (voice) | 1 |
| TV Show | 2010 | Fish Hooks | Portswain (voice) | 1 |
| TV Show | 1997 | I Am Weasel | Beaver #2 / Owl #1 (voice) | 1 |
| TV Show | 2014 | Mixels | Mixadel | 1 |
| TV Show | 2014 | Mixels | Scrud, Splasho | 1 |
| TV Show | 2016 | The Comeback Kids | Richie | 1 |
| TV Show | 2016 | Skylanders Academy | Kaos (voice) | 38 |
| TV Show | 2001 | The Fairly OddParents | Chuck (voice) | 1 |
| TV Show | 2004 | Dave the Barbarian | Ned Frischman (voice) | 1 |
| TV Show | 2004 | Dave the Barbarian | Ned Frishman / Guard / Vicious Looking Warrior (voice) | 1 |
| TV Show | 2012 | The Bite-Sized Adventures of Sam Sandwich | Fryborg / Big Cheese / Salty Pup (voice) | 10 |
| TV Show | 1988 | The Munsters Today | Howie Buchanan | 2 |
| TV Show | 2003 | That's So Raven | Teddy | 1 |
| TV Show | 1993 | Power Rangers | Mantamobile (voice) | 1 |
| TV Show | 2022 | Sketchy Queens | Various Characters | 1 |
| TV Show | 2021 | Jellystone! | Billy / Mogar / Rodney J. Squirrel (voice) | 1 |
| TV Show | 2015 | Wonder Quest | Lacky (Voice) | 10 |
| TV Show | 2020 | Helluva Boss | Moxxie (voice) | 20 |
