Jenko y Schmidt son dos jóvenes policías especializados en pasar por adolescentes para resolver casos acorde con su edad.
 | Jonah Hill | Schmidt |
 | Channing Tatum | Jenko |
 | Brie Larson | Molly Tracey |
| Dave Franco | Eric Molson |
| Ice Cube | Capitán Dickson |
| DeRay Davis | Domingo |
| Rob Riggle | Mr. Walters |
 | Caroline Aaron | Annie Schmidt |
| Joe Chrest | David Schmidt |
| Ellie Kemper | Ms. Griggs |
| Dax Flame | Zack |
| Dakota Johnson | Fugazy |
| Rye Rye | Jr. Jr. |
| Chris Parnell | Mr. Gordon |
| Justin Hires | Juario |
| Johnny Pemberton | Delroy |
| Stanley Wong | Roman |
| Brett Lapeyrouse | Amir |
| Lindsey Broad | Lisa |
| Jake M. Johnson | Director Dadier |
| Nick Offerman | Comisario Hardy |
| Randal Reeder | Karl |
| Geraldine Singer | Phyllis |
| Luis Da Silva Jr. | Luis |
| Johnny Simmons | Billiam Willingham |
| Spencer Boldman | French Samuels |
| Holly Robinson Peete | Judy Hoffs |
 | Johnny Depp | Tom Hanson |
| Peter DeLuise | Doug Penhall |
