Jon Lee (alt Frankie Valli), Jon Boydon (Tommy Devito), David McGranaghan (Nick Massi), Edd Post (Bob Gaudio), Nicola Brazil (Mary Delgado), Will Barratt (Bob Crewe), Mark Halliday (u/s Gyp De Carlo), Ben Jennings (Joey), Jake Samuels (Norm Waxman), Lucy Martin (Lorraine), Rebecca Jayne Davies (Francine), Mark Isherwood (u/s Billy Dixon), Tommie Earl Jenkins (Hal Miller), Chris Gardner (Hank Majewski)