A guy who danced with what could be the girl of his dreams at a costume ball only has one hint at her identity: the Zune she left behind as she rushed home in order to make her curfew. And with a once-in-a-lifetime opportunity in front of him, he sets out to find his masked beauty.
| Actor | Role |
|---|---|
 Selena GomezMary Santiago | Mary Santiago |
 Drew SeeleyJoey Parker | Joey Parker |
 Jane LynchDominique Blatt | Dominique Blatt |
 Katharine IsabelleBree Blatt | Bree Blatt |
 Emily PerkinsBritt Blatt | Britt Blatt |
 Jessica Parker KennedyTami | Tami |
 Marcus T. PaulkDustin | Dustin |
 Nicole LaPlacaNatalia Faroush | Natalia Faroush |
 Lynda BoydEvie Parker | Evie Parker |
 Lorena GaleHelga | Helga |
 Alex ZaharaBritish Director | British Director |
 Colin FooLee-Ha | Lee-Ha |
 Garwin SanfordRod Parker | Rod Parker |
| JJagoda JanikGoth Girl | Goth Girl |
 Laura CarswellMoon-eyed Cheerleader | Moon-eyed Cheerleader |
 Stuart CowanDebate Team Dude | Debate Team Dude |
 Giacomo BaessatoFootball Jock | Football Jock |
 Donald AdamsTeacher | Teacher |
 Elle-Máijá TailfeathersAmazonian Model Girl | Amazonian Model Girl |
 Nicole MuñozYoung Mary - 11 years | Young Mary - 11 years |
| MMia Aida DuranYoung Mary - 3 years | Young Mary - 3 years |
| TTaylor JamesBallet Boy | Ballet Boy |
| DDanielle Dunn-MorrisMAPA Admissions | MAPA Admissions |
 Liam Raymond DibDancer (uncredited) | Dancer (uncredited) |