Jerry O'Connell
— Hayden (voice)
Dick Van Dyke
— Yusop (voice)
Ja Rule
— Fenn (voice)
Chris Daughtry
— Counselor Olaf (voice)
Tionne Watkins
— Jarvik (voice)
Debi Derryberry
— Counselor Jessica / Adrian / Kid #1 (voice)
Dylan Vox
— Finntoozler (voice)
Greg Cipes
— Oppenhop / Flint / Klorg (voice)
Tammy Klein
— Sapseat (voice)
Aaron Witlin
— Additional Voices
Ana Florit
— Additional Voices
Andi Royer
— Additional Voices
Brie Cubelic
— Additional Voices
Bryan Dietzman
— Additional Voices
Emily Mae Heller
— Additional Voices
Malia Suarez
— Additional Voices
Pierre Charpilloz
— Additional Voices
Ryan Ebert
— Additional Voices