• Greg Heffley as Timmy
  • Robert Jefferson as Cosmo
  • Linda Jefferson as Wanda
  • Manny Heffley as Poof
  • Sweetie as Sparky
  • Frank Heffley as Timmy's Dad
  • Susan Heffley as Timmy's Mom
  • Patty Ferrell as Vicky
  • Rowley Jefferson as Chester
  • Edd (from Ed, Edd, n Eddy) as A.J.
  • Rodrick Heffley as Mr. Crocker
  • Buford (from Phineas and Ferb) as Francis
  • Chriag Gupta as Sanjay
  • Billy (from The Grim Adventures of Billy and Mandy) as Elmer
  • Pete Hosey as Jorgen Von Strangle

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