• Kevin as Greg Heffley
  • Stuary as Rowley Heffley
  • Gru as Roderick Heffley
  • Mark as Susan Heffley
  • Bob as Manny Heffley
  • Jorge as Holly Hills
  • Tim as Mr. Jefferson
  • Margo (from Despicable Me) as Mrs. Jefferson
  • Pipsqueak (from Dr. Seuss' The Lorax) as Sweetie
  • Young Once-ler (from Dr. Seuss' The Lorax) as Chirag Gupta
  • Scarlett as Patty Farrel
  • Agnes (from Despicable Me) as Heather Hills
  • Herb as Mr. Gerabit
  • Jerry as Grandpa
  • The Lorax (from Dr. Seuss' The Lorax) as The Craium Shaker Guy

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