Cast & crew
The Invisible Ray (1936)
Directed by Lambert Hillyer Written by John Colton, Douglas Hodges
Cast
| Boris Karloff | Dr. Janos Rukh |
| Violet Kemble Cooper | Mother Rukh |
| Bela Lugosi | Dr. Felix Benet |
| Frank Lawton | Ronald Drake |
| Frances Drake | Diana Rukh |
| Walter Kingsford | Sir Francis Stevens |
| Paul Weigel | Monsieur Noyer |
| Georges Renavent | Chief of the Surete |
| Beulah Bondi | Lady Arabella Stevens |
| Frank Reicher | Professor Meiklejohn |
| May Beatty | Mme. LeGrand (uncredited) |
| Paul McAllister | Papa LaCosta (uncredited) |
| Ynez Seabury | Celeste (uncredited) |
| Robert Graves | Gendarme (uncredited) |
| Nydia Westman | Briggs (uncredited) |
Crew
| Lambert Hillyer | Director |
| George Robinson | Director of Photography |
| Howard Higgin | Original Story |
| Camille Collins | Production Secretary |
| Charles Carroll | Sound Recordist |
| John Colton | Screenplay |
| Franz Waxman | Original Music Composer |
| Fred S. Meyer | Executive Producer |
| Douglas Hodges | Story |
| Edmund Grainger | Producer |
| Bernard W. Burton | Editor |
| Otto Lederer | Makeup Artist |
| Albert S. D'Agostino | Art Direction |
| Raymond Lindsay | Special Effects |
| John P. Fulton | Visual Effects |
| Jack Pierce | Makeup Artist |
| Gilbert Kurland | Sound Supervisor |