The Good Feathers: (the pigeons)
Bobby:....................................................................... John Mariano
Pesto:........................................................................ Chick Vennera
Squit:......................................................................... Maurice LaMarche

The Hip Hippos:
Flavio:....................................................................... Frank Welker (singing: Ray McLeod)
Marita:....................................................................... Tress MacNeille

Dr. Otto Scratchansniff:........................................... Rob Paulsen
Hello Nurse:.............................................................. Tress MacNeille

Slappy Squirrel:......................................................... Sherri Stoner
Skippy:........................................................................ Nathan Ruegger

Pinky:........................................................................... Rob Paulsen
The Brain:.................................................................... Maurice LaMarche

Rita:............................................................................. Bernadette Peters
Runt:............................................................................ Frank Welker

Mindy:.......................................................................... Nancy Cartwright
Buttons:....................................................................... Frank Welker

Minerva Mink:............................................................. Julie Brown
Newt

Chicken Boo:............................................................... Frank Welker
Thadius Plotz (CEO):................................................... Frank Welker
Albert Einstein:............................................................ Paul Rugg
Dr. Phrankenstein:....................................................... Adirenne Alexander
Narrator:........................................................................ Ernie Anderson
Vern:.............................................................................. Ed Asner
Carloota:....................................................................... Ivy Austin