- Matilda Wormwood as Greg Heffley
- Lavender as Rowley Jefferson
- Harry Wormwood as Frank Heffley
- Zinnia Wormwood as Susan Heffley
- Michael Wormwood as Rodrick Heffley
- Manny Heffley as himself
- Amanda Thripp as Patty Farrell
- Agatha Trunchbull as Mr. Huff
- Miss Honey as Holly Hills
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