Eep reveals how a comical accident led her and Dawn to discover the joys of tricking their families and set about performing "the world's first pranks."
| Actor | Role |
|---|---|
 Emma StoneEep (voice) | Eep (voice) |
 Kelly Marie TranDawn Betterman (voice) | Dawn Betterman (voice) |
 Nicolas CageGrug (voice) | Grug (voice) |
 Ryan ReynoldsGuy (voice) | Guy (voice) |
 Catherine KeenerUgga (voice) | Ugga (voice) |
 Cloris LeachmanGran (voice) | Gran (voice) |
 Clark DukeThunk (voice) | Thunk (voice) |
 Leslie MannHope Betterman (voice) | Hope Betterman (voice) |
 Peter DinklagePhil Betterman (voice) | Phil Betterman (voice) |