Movies:
* Scooby-Doo on Zombie Island (1998) - as "The Ghost of Captain Cutler"
* Scooby-Doo! Legend of the Phantosaur (2011) - as "The Phantosaur"
* Justice League: Crisis on Two Earths (2010) - as "The Flash"
* Justice League: The Flashpoint Paradox (2013) - as "The Flash"
* Justice League: Throne of Atlantis (2015) - as "The Flash"
* Justice League vs. Teen Titans (2016) - as "The Flash"
* Justice League: Gods and Monsters (2015) - as "The Flash"
* Justice League: War (2014) - as "The Flash"
Television Series:
* The Spectacular Spider-Man (2008-2009) - as "Hobgoblin"
* Young Justice (2010-2013, 2019-present) - as "Kid Flash"
* Teen Titans (2003-2006) - as "Robin"
* Justice League Unlimited (2004-2006) - as "Robin", "Kid Flash", "Blue Beetle"
* The Batman (2004-2008) - as "Robin"
* Code Lyoko (2003-2007) - as "Jeremy Belpois"
* Iron Man: Armored Adventures (2009-2012) - as "Speed Demon"
* Wolverine and the X-Men (2008-2009) - as "Nightcrawler"
* Star Wars: The Clone Wars (2008-2020) - as various roles
* Transformers: Animated (2007-2009) - as various roles
* The Amazing Spider-Man (1994-1998) - as "Hobgoblin"
* The Powerpuff Girls (1998-2005) - as various roles
Anime:
* Naruto (2002-2007) - as "Sasuke Uchiha"
* Naruto Shippuden (2007-2017) - as "Sasuke Uchiha"
* Bleach (2004-2012) - as "Ichigo Kurosaki"
* Death Note (2006-2007) - as "Light Yagami"
* Fullmetal Alchemist: Brotherhood (2009-2010) - as "Roy Mustang"
This is not an exhaustive list, but it highlights some of Kirby Morrow's most memorable roles. His contributions to animation and voice acting were extensive and greatly appreciated by fans.