Cast & crew
The Firefly (1937)
Directed by Robert Z. Leonard Written by Albert Hackett, Frances Goodrich
Cast
| Jeanette MacDonald | Nina |
| Allan Jones | Diego |
| Warren William | Major Iceborg |
| Billy Gilbert | Innkeeper |
| Henry Daniell | Savary |
| Douglass Dumbrille | Frà Melito |
| Leonard Penn | Etienne |
| Tom Rutherford | King Randor |
| Matthew Boulton | Wellington |
| Belle Mitchell | Lola |
| George Zucco | Service |
| Corbet Morris | Duval |
| Stanley Price | (uncredited) |
| Ian Wolfe | Izquierdo |
| Brandon Hurst | (uncredited) |
| Pedro de Cordoba | (uncredited) |
| Edward Keane | (uncredited) |
| Dennis O'Keefe | (uncredited) |
| Theodore von Eltz | (uncredited) |
| Robert Spindola | (uncredited) |
| Jason Robards Sr. | (uncredited) |
| Rolfe Sedan | (uncredited) |
| Frank Puglia | (uncredited) |
| Karl Hackett | Spaniard |
| Lane Chandler | (uncredited) |
| Ralph Byrd | (uncredited) |
| Maurice Black | Pigeon |
| Pat Somerset | (uncredited) |
| Sidney Bracey | (uncredited) |
| Drew Demorest | (uncredited) |
| William Crowell | (uncredited) |
| Lester Dorr | (uncredited) |
| Donald Reed | (uncredited) |
| Pilar Arcos | (uncredited) |
| Zita Baca | (uncredited) |
| Soledad Gonzales | (uncredited) |
| Robert Z. Leonard | (uncredited) |
| William H. O'Brien | (uncredited) |
Crew
| Otto A. Harbach | Theatre Play |
| Albert Hackett | Screenplay |
| Ogden Nash | Adaptation |
| Frances Goodrich | Screenplay |
| Robert Z. Leonard | Director |
| Rudolf Friml | Songs |
| Joseph M. Newman | Assistant Director |
| Adrian | Costume Design |
| George Forrest | Lyricist |
| Gus Kahn | Lyricist |
| Robert Wright | Lyricist |
| Otto A. Harbach | Lyricist |
| Herbert Stothart | Songs |
| Oliver T. Marsh | Director of Photography |
| Cedric Gibbons | Art Direction |
| Hunt Stromberg | Producer |
| Robert Z. Leonard | Producer |
| Robert Kern | Editor |