- Mike O'Donnell (17 years old) as Curtis, the Caveman
- Mike O'Donnell (37 years old) as Phillip "Phil" Rupert Diffy
- Ned Gold (37 years old) as Lloyd Diffy
- Alex O'Donnell as Bradley Benjamin Farmer
- Scarlett O'Donnell (37 years old) as Keely Teslow
- Maggie O'Donnell as Pim Diffy
- Jamie as Barbara Diffy
- Principal Jane Masterson as Deborah Hortence "Debbie" Berwick
- Coach Murphy as Vice Principal Neil Hackett
- Cameron as Lil Danny Dawkins
- Samantha as Tia
- and more
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