• Thomas as Kermit the Frog
  • Percy as Gonzo the Great
  • Toby as Fozzie Bear
  • Bertie as Rizzo the Rat
  • Henry as Dr. Teeth
  • Smudger as Animal
  • James as Floyd
  • Duck as Zoot
  • Molly as Janice
  • Emily as Miss Piggy
  • Falcon (from Stuart Little 2) as K. Edgar Singer
  • Talking Sandwich as himself
  • Leonardo & Michelangelo (from Teenage Mutant Ninja Turtles) as Space Fish
  • Jeremy as Ubergonzo
  • Percy's Green Engines as Gonzo's slibings
  • Gordon as Sam the Eagle
  • Toad as Beaker
  • Harvey as Dr. Bunsen Honeydew
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