He also appeared in films, such as Grease, The Polar Express, and WarGames.
All of his Disney roles are listed below.
- 1980 - Midnight Madness as Wesley - White Team Leader
- 1991 - Darkwing Duck as Mouth
- 1992 - Goof Troop as Road Hogs Biker
- 1996 - Mighty Ducks as Alvin Yasbeck
- 1996 - Timon & Pumbaa as Bahuka
- 1996 - Spy Hard as Rancor Guard who gets spit on
- 1997 - The Brave Little Toaster to the Rescue as Charlie
- 1999 - Recess as Frank 'Tiny' Sedgwick
- 2001-2003 - Lloyd in Space as Larry
- 2002-2007 - Kim Possible as Ned
- 2005 - Kim Possible Movie: So the Drama as Ned
- 2011 - Handy Manny as Zip the power socket tool
- 2015 - Star vs. the Forces of Evil as Squares
- Deezen was once considered for the role of Judge Doom in Who Framed Roger Rabbit along with several other actors that were also considered. He was also considered for the voice role of Roger Rabbit.