 | Henry Hull als Dr. Wilfred Glendon |
 | Warner Oland als Dr. Yogami |
 | Valerie Hobson als Lisa Glendon |
 | Lester Matthews als Paul Ames |
 | Lawrence Grant als Sir Thomas Forsythe |
 | Spring Byington als Ettie Coombes |
 | Clark Williams als Hugh Renwick |
 | J.M. Kerrigan als Hawkins |
 | Charlotte Granville als Lady Forsythe |
 | Ethel Griffies als Mrs. Whack |
 | Zeffie Tilbury als Mrs. Moncaster |
 | Jeanne Bartlett als Daisy |
 | Reginald Barlow als Timothy the Falden Caretaker (uncredited) |
 | Egon Brecher als Priest (uncredited) |
 | Herbert Evans als Detective Evans (uncredited) |
| Connie Leon als Yogami's Housekeeper Millie (uncredited) |
| Amber Norman als Girl in Goose Lane (uncredited) |
 | Tempe Pigott als Drunk Woman (uncredited) |
 | Harry Stubbs als Officer Jenkins (uncredited) |
 | Eole Galli als The Prima Donna |
| Wong Chung |
| J. Gunnis Davis |
 | Dick Gordon |
| Helena Grant |
 | Boyd Irwin |
| Noel Kennedy |
| George Kirby |
| Maude Leslie |
| James May |
| William Millman |
| Edmund Mortimer |
| Joseph North |
| David Thursby |
| Louis Vincenot |
| Beal Wong |
| John Colton | Screenplay |
| Stuart Walker | Director |
| Robert Harris | Story |
| Robert Harris | Associate Producer |
| Russell F. Schoengarth | Editor |
| Albert S. D'Agostino | Art Direction |
| Stanley Bergerman | Executive Producer |
| Charles J. Stumar | Director of Photography |
| Karl Hajos | Original Music Composer |
| Jack Pierce | Makeup Artist |
| Lester Kahn | Grip |
| Muriel Yoemans | Production Secretary |
| Billy Moritz | Production Secretary |
| Milton Carruth | Editor |
| Irving Smith | Lighting Technician |
| Mary West | Child Wrangler |
| Robert Laszlo | Property Master |
| Harvey Gates | Adaptation |
| Edmund Pearson | Writer |
| Mary Dolor | Hair Setup |
| Armand Triller | Makeup Artist |
| Charles S. Gould | Assistant Director |
| Phil Karlson | Assistant Director |
| Frank Artman | Boom Operator |
| Donald Cunliffe | Sound Recordist |
| Gilbert Kurland | Sound Supervisor |
| Bob Richards | Sound Mixer |
| John P. Fulton | Special Effects |
| David S. Horsley | Special Effects Assistant |
| George DeNormand | Stunt Double |
| Eddie Parker | Stunt Double |
| Harvey Parry | Stunt Double |
| E. Brown | Grip |
| A. Buckley | Grip |
| Maury Gertsman | Camera Operator |
| John J. Martin | Assistant Camera |
| Maurice Pivar | Supervising Editor |
| Gilbert Kurland | Music Supervisor |
| Karl Hajos | Conductor |
| Abe Meyer | Music Coordinator |
| Heinz Roemheld | Music |
| Clifford Vaughan | Orchestrator |
| Jean Raymond | Script Researcher |
| Archie Hall | Technical Supervisor |
