When the leading lady of a low-budget musical revue sprains her ankle, the assistant stage manager is forced to understudy and perform in her place.
| Actor | Role |
|---|---|
 TwiggyPolly | Polly |
| CChristopher GableTony | Tony |
 Max AdrianMax | Max |
 Bryan PringlePercy | Percy |
 Murray MelvinAlphonse | Alphonse |
 Moyra FraserMme. Dubonnet | Mme. Dubonnet |
 Georgina HaleFay | Fay |
| SSally BryantNancy | Nancy |
 Vladek SheybalDe Thrill | De Thrill |
 Tommy TuneTommy | Tommy |
 Brian MurphyPeter | Peter |
| GGraham ArmitageMichael | Michael |
| AAntonia EllisMaisie | Maisie |
| CCaryl LittleDulcie | Dulcie |
 Anne JamesonMrs. Peter | Mrs. Peter |
 Catherine WillmerCatherine | Catherine |
| RRobert La'BassiereChauffeur | Chauffeur |
 Barbara WindsorHortense | Hortense |
 Glenda JacksonRita Monroe | Rita Monroe |
 Imogen ClaireDancer (uncredited) | Dancer (uncredited) |
| SSusan ClaireDancer (uncredited) | Dancer (uncredited) |
| PPetra SiniawskiDancer (uncredited) | Dancer (uncredited) |
| PPeter GreenwellPianist (uncredited) | Pianist (uncredited) |
 Steven LonghurstTheatre Worker (uncredited) | Theatre Worker (uncredited) |
 Kenneth ColleyKing in fantasy sequence (uncredited) | King in fantasy sequence (uncredited) |