• Yakko as Thomas
  • Dr. Otto Edward
  • Ralph as Henry
  • Mr. Plotz as Gordon
  • Pesto as James
  • Wakko as Percy
  • Skippy Squirrel as Toby
  • Elmyra Duff (from Tiny Toon Adventures) as Annie
  • Fifi La Fume (from Tiny Toon Adventures) as Clarabel
  • King Acorn (from Sonic The Hedgehog) as Sir Topham Hatt
  • Sally Acorn (from Sonic The Hedgehog) as Mrs. Kyndley
  • Sawtooth (from Wacky Races) as Thomas's Driver
  • Baloney Terence (speaks only in Japanese dub)
  • Squit as Bertie (cameo)
  • Harriet (from Tiny Toon Adventures) as Henrietta (cameo)



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