Former high school musical star, Marc Pease, finds himself still living in the past, eight years after graduating.
| Actor | Role |
|---|---|
 Jason SchwartzmanMarc Pease | Marc Pease |
 Anna KendrickMeg Brickman | Meg Brickman |
 Ben StillerJon Gribble | Jon Gribble |
 Jay PaulsonGerry | Gerry |
 Cullen MossYoung Father | Young Father |
 B.J. ArnettMrs. Pleased | Mrs. Pleased |
 Jared GrimesThe Wiz | The Wiz |
 Ebon Moss-BachrachGavin | Gavin |
 Gabrielle DennisTracey | Tracey |
 Amber BrookeIlona | Ilona |
| SShannon HoltDebbie | Debbie |
| AAustin HerringMr. Edwards | Mr. Edwards |
 Ed WagensellerScience Teacher | Science Teacher |
 Kelen ColemanStephanie | Stephanie |
 Joe InscoeMr. Brickman | Mr. Brickman |
 Matthew CornwellRick Berger | Rick Berger |
 Lou CriscuoloBenny Berger | Benny Berger |
 Shon BlotzerJeff Bluff | Jeff Bluff |
| DDebra NelsonWoman at Luncheon | Woman at Luncheon |
| BBridget GethinsCraig's Mother | Craig's Mother |
 Zachary BoothCraig | Craig |
 Carissa CapobiancoJen | Jen |
 Cameron ArnettMr. Pleased | Mr. Pleased |
| MMillard DardenPascal | Pascal |
 Damien C. HaasTechie | Techie |
 Martha NicholsTania | Tania |
 Patrick StognerFreshman Stagehand | Freshman Stagehand |
 Taylor KowalskiRodney | Rodney |
 Kassie HightThe Wiz Poppy | The Wiz Poppy |
 Nick NordellaStagehand | Stagehand |