• Greg Heffley as Peter
  • Holly Hills as Lois
  • Megara (from Hercules) as Meg
  • Rowley Jefferson as Chris
  • Mr. Gerabit as Stewie
  • Ned Flanders (from The Simpsons) as Brian
  • Frank Heffley as Joe
  • Rodrick Heffley as Mort
  • Rajah (from Aladdin) as Cleveland
  • Prince Eric (from The Little Mermaid) as Herbert
  • Mr. Jefferson as Tom Tucker
  • Agent Suggs (from Alvin and the Chipmunks: The Road Chip) as Ernie the Giant Chicken

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