Steve CarellMayor (voice)
Carol BurnettKangaroo (voice)
Dan FoglerCouncilman / Yummo Wickersham (voice)
Isla FisherDr. Mary Lou Larue (voice)
Amy PoehlerSally O'Malley (voice)
Jaime PresslyMrs. Quilligan (voice)
Charles OsgoodNarrator (voice)
Niecy Nash-BettsMiss Yelp (voice)
Jesse McCartneyJoJo (voice)
Shelby AdamowskyHedy / Hooly (voice)
Jack AngelOld Time Who (voice)
Caitlin Rose AndersonHelen (voice)
Emily AndersonHeather (voice)
Jan RabsonTown Cryer (voice)
Jess HarnellAnother Who (voice)
Debi DerryberryWho Mom (voice)
Samantha DrokeHildy / Holly (voice)
Karen DisherWho Kid (voice)
Marshall EfronWickersham Guard 1 (voice)
Bill FarmerWillie Bear (voice)
Jason FricchioneJoe (voice)
Heather GoldenhershWho Girl (voice)
Selena GomezHelga (voice)
Jimmy HaywardObnoxious Who (voice)
Christina MartinoHeidi / Haley (voice)
Ellie MartinoHanna (voice)
Laraine NewmanGlummox Mom (voice)
Tim NordquistWickersham Guard 2 (voice)
Colleen O'ShaughnesseyAngela (voice)
Laura OrtizJessica (voice)
Joe PasqualeThe Dentist (voice)
Connor AndersonWho Child #1 (voice)
Isabella AcresAdditional Voices (voice)
Bob BergenAdditional Voices (voice)
Jeff BiancalanaAdditional Voices (voice)
Madison DavenportAdditional Voices (voice)
Teresa GanzelAdditional Voices (voice)
Kathy Graves ToonAdditional Voice (voice)
Sherry LynnAdditional Voices (voice)
Danny MannAdditional Voices (voice)
Mona MarshallAdditional Voices (voice)
Mickie McGowanAdditional Voices (voice)
Madison PettisAdditional Voices (voice)
Grace RolekAdditional Voices (voice)
Jennessa RoseAdditional Voices (voice)
Ariel WinterAdditional Voices (voice)
Fletcher SheridanJojo (singing voice) (uncredited)
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