Characters played by Debi Derryberry
Jimmy Neutron
Characters played by Tara Strong
Timmy
Characters played by Jeff Garlin
Villain
Characters played by Rob Paulsen
Carl
Eustace
Butler
Bucky McBadbat
Characters played by Jeffrey Garcia
Sheen
Characters played by Carolyn Lawrence
Cindy
Mrs. Folfax
Libby's Mom
Characters played by Crystal Scales
Libby
Characters played by Mark DeCarlo
Hugh
Characters played by Jason Marsden
Chester
Characters played by Gary LeRoi Gray
A.J.
Characters played by Susanne Blakeslee
Wanda
Mom
Characters played by Daran Norris
Cosmo
Dad
Jorgen
Characters played by Carlos Alazraqui
Mr. Crocker
Characters played by Billy West
Blix
British Official
Sam
Corky Shimazu
Characters played by Jay Leno
Nega-Chin
Characters played by Megan Cavanagh
Judy Neutron
Characters played by Nic Nagel
Additional Voices