Victoria Justice Actor Daniella Monet Actor Leon Thomas III Actor Elizabeth Gillies Actor Avan Jogia Actor Ariana Grande Actor Matt Bennett Actor Ryan Alvarez Quartet Member Guest Star Austin Anderson Drummer Guest Star Bobo Chang Eric Guest Star Caden Michael Gray Sinjin's Friend 1 Guest Star Mollee Gray Dancer Guest Star Payson Lewis Quartet Member Guest Star Roderick McCarthy Jaime Guest Star Bruce Merkle Quartet Member Guest Star Veno Miller Bassist Guest Star Dawn Morrow Christine Guest Star Sydney Pierick Kristen Guest Star Ryan Powers Quartet Member Guest Star Michael Eric Reid Sinjin Van Cleef Guest Star Jivanta Roberts Dancer Guest Star Lucas Ross Guitarist Guest Star Ryan Rottman Ryder Guest Star Halston Sage Sadie Guest Star Gabby Sansosti Dancer Guest Star Alec Tokar Sinjin's Friend 2 Guest Star Paula Van Oppen Dancer Guest Star Dan Schneider Executive Producer