Debi Derryberry
Jimmy Neutron (voice)
Tara Strong
Timmy / School Girl (voice)
Rob Paulsen
Carl / Anti-Fairy Walla (voice)
Jeffrey Garcia
Sheen / Anti-Fairy Walla (voice)
Carolyn Lawrence
Cindy Vortex (voice)
Crystal Scales
Libby Folfax (voice)
Frank Welker
Goddard (voice)
Susanne Blakeslee
Wanda / Mom / Anti-Wanda / Anti-Fairy #1 (voice)
Daran Norris
Cosmo / Dad / Jorgen Von Strangle / Anti-Cosmo (voice)
Carlos Alazraqui
Mr. Crocker (voice)
Dee Bradley Baker
Binky (voice)
Gary LeRoi Gray
A.J. (voice)
Jim Ward
Chet Ubetcha / Anti-Fairy #2 (voice)
Jeff Bennett
Dr. Moist (voice)
Kevin Michael Richardson
Morgan Freeman / Anti-Fairy Walla (voice)
Tim Curry
Professor Finbarr Calamitous (voice)
Chris Kirkpatrick
Chip Skylark (voice) (archive audio) (uncredited)
Grey DeLisle
Vicky (voice)