A group of singing, child-friendly puppets' world is shaken up when they graduate from letters and numbers and are transferred to an inner-city high school filled with drugs, gangs, and violence.
| Actor | Role |
|---|---|
| SSpencer GrinbergTommy (voice) / Principal McGuffin (voice) | Tommy (voice) / Principal McGuffin (voice) |
 Francis MellingWendell (voice) | Wendell (voice) |
| CCatherine ZanonSally (voice) / Ms.Dingleberry (voice) | Sally (voice) / Ms.Dingleberry (voice) |
 Sandro RostaPunch | Punch |
 Vienna BrandstatterVasilika | Vasilika |
| MMatt AlfanoPatches (voice) | Patches (voice) |
| MMateo Galindo-TorresJoaquin | Joaquin |
| TTyler BursteinBoris | Boris |
| NNeil HewittMr. Friendly | Mr. Friendly |
| TTed PowersJanitor | Janitor |
| MMark BoutrosHarold | Harold |
| EElizabeth DundasLinda | Linda |
| JJustin WilsonAdditional voices (voice) | Additional voices (voice) |
| AAaron RubinoffAdditional voices (voice) | Additional voices (voice) |