• Dr. John Dolittle as Thomas
  • Grandpa Archer Dolittle as Duck
  • Dr. Mark Weller as Bertie
  • Calloway as James
  • Lucky the Dog as Harold
  • Rodney the Guinea Pig as Sir Topham Hatt
  • Dr. Gene "Geno" Reiss as Stephen Hatt
  • Lisa Dolittle as Emily
  • Dr. Fish as BoCo
  • Rat #1 as Arry
  • Rat #2 as Bert
  • Old Beagle as Skarloey
  • Baby Tiger as Arthur
  • Maya Dolittle as Rosie
  • Charisse Dolittle as Sally
  • Possum as Splatter
  • Bettleheim the Cat as Oliver
  • Male Pigeon as Donald
  • Female Pigeon as Daisy
  • Siberian Husky as Spencer
  • Skunk as Diesel
  • and more

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