Wren's Halloween plans go awry when she's made to babysit her brother, who disappears into a sea of trick-or-treaters. Accompanied by her best friend and two nerdy classmates, Wren needs to find her brother before her mom finds out.
| Actor | Role |
|---|---|
 Victoria JusticeWren DeSantis | Wren DeSantis |
 Jane LevyApril Martin | April Martin |
 Thomas MannRoosevelt Leroux | Roosevelt Leroux |
 Thomas McDonellAaron Riley | Aaron Riley |
 Chelsea HandlerJoy DeSantis | Joy DeSantis |
 Jackson NicollAlbert DeSantis | Albert DeSantis |
 Osric ChauPeng Chong | Peng Chong |
 Thomas MiddleditchFuzzy | Fuzzy |
 Riki LindhomeDenise (Galaxy Scout) | Denise (Galaxy Scout) |
 Josh PenceKeevin | Keevin |
 Johnny KnoxvilleJörgen | Jörgen |
 Abby ElliottLara | Lara |
 Ana GasteyerJackie Leroux | Jackie Leroux |
 Kerri KenneyBarb Leroux | Barb Leroux |
| PPatrick de LedeburMike Puglio | Mike Puglio |
 Holmes OsborneMr. Brueder | Mr. Brueder |
 Annie FitzpatrickMrs. Brueder | Mrs. Brueder |
 James PumphreyNate Brueder | Nate Brueder |
 Peter Navy TuiasosopoMr. Mahani | Mr. Mahani |
 Lori Pelenise TuisanoMrs. Mahani | Mrs. Mahani |
| EErin ScerbakAndrea | Andrea |
 Rachel SterlingKassi | Kassi |
| NNicholas VarricchioJonathan | Jonathan |
| MMaria PerossaHailey | Hailey |
 Barry LivingstonHalloween Dad | Halloween Dad |
 Zoe AggelikiMelinda | Melinda |
 Kim EvansBallerina (uncredited) | Ballerina (uncredited) |