| Photos (see all 5 | slideshow) |
| Boris Karloff | ... | Dr. Janos Rukh (as Karloff) | |
| Bela Lugosi | ... | Dr. Felix Benet | |
| Frances Drake | ... | Diane Rukh | |
| Frank Lawton | ... | Ronald Drake | |
| Violet Kemble Cooper | ... | Mother Rukh | |
| Walter Kingsford | ... | Sir Francis Stevens | |
| Beulah Bondi | ... | Lady Arabella Stevens | |
| Frank Reicher | ... | Professor Meiklejohn | |
| Paul Weigel | ... | Monsieur Noyer | |
| Georges Renavent | ... | Chief of the Surete (as Georges Renevant) | |
| rest of cast listed alphabetically: | |||
| Ernie Adams | ... | Bit part (uncredited) | |
| Ricca Allen | ... | Bystander (uncredited) | |
| Charles Bastin | ... | French Newsboy (uncredited) | |
| May Beatty | ... | Mme. LeGrand (uncredited) | |
| Ted Billings | ... | Counterman (uncredited) | |
| Ernest Bowern | ... | French Newsboy (uncredited) | |
| Helen Brown | ... | The Blind Girl's Mother (uncredited) | |
| Daisy Bufford | ... | Mother of Infant (uncredited) | |
| André Cheron | ... | Surete Official Checking Names (uncredited) | |
| Alex Chivra | ... | Cook (uncredited) | |
| Ann Marie Conte | ... | The Blind Girl (uncredited) | |
| Edwards Davis | ... | Scientist (uncredited) | |
| Jean De Briac | ... | Gendarme (uncredited) | |
| Dudley Dickerson | ... | Safari Member (uncredited) | |
| Charles Fallon | ... | Gentleman (uncredited) | |
| Constant Franke | ... | Police Detective (uncredited) | |
| Clarence Gordon | ... | Porter and Servant (uncredited) | |
| Robert Graves | ... | Gendarme (uncredited) | |
| Winter Hall | ... | The Minister (uncredited) | |
| Daniel L. Haynes | ... | Rukh's Head Bearer (uncredited) | |
| Isabel La Mal | ... | Bystander (uncredited) | |
| Francisco Marán | ... | Gendarme (uncredited) | |
| Alphonse Martell | ... | Surete Official Checking Names (uncredited) | |
| Paul McAllister | ... | Papa LaCosta (uncredited) | |
| Etta McDaniel | ... | Diane's Safari Attendant (uncredited) | |
| Walter Miller | ... | The Derelict (uncredited) | |
| Edward Reinach | ... | Scientist (uncredited) | |
| Hans Schumm | ... | The Clinic Valet (uncredited) | |
| Ynez Seabury | ... | Celeste - a Maid (uncredited) | |
| Lawrence Stewart | ... | The Runner-boy (uncredited) | |
| Adele St. Mauer | ... | Mme. Noyer (uncredited) | |
| Fred 'Snowflake' Toones | ... | Native Who First Sees Rukh Glow (uncredited) | |
| Ray Turner | ... | Bearer with Geiger Counter (uncredited) | |
| Lucio Villegas | ... | Pierre - a Butler (uncredited) | |
| Nydia Westman | ... | Briggs - a Maid (uncredited) | |
| Lloyd Whitlock | ... | Scientist (uncredited) | |
Directed by | |||
| Lambert Hillyer | |||
Writing credits | ||
| Howard Higgin | (original story) & | |
| Douglas Hodges | (original story) | |
| John Colton | (screenplay) | |
Produced by | |||
| Edmund Grainger | .... | producer | |
| Fred S. Meyer | .... | executive producer (uncredited) | |
Original Music by | |||
| Franz Waxman | |||
Cinematography by | |||
| George Robinson | |||
Film Editing by | |||
| Bernard W. Burton | (as Bernard Burton) | ||
Art Direction by | |||
| Albert S. D'Agostino | |||
Costume Design by | |||
| Brymer | (gowns) | ||
Makeup Department | |||
| Otto Lederer | .... | makeup artist (uncredited) | |
| Jack P. Pierce | .... | makeup artist (uncredited) | |
Second Unit Director or Assistant Director | |||
| Fred Frank | .... | assistant director (uncredited) | |
| Sergei Petschnikoff | .... | assistant director (uncredited) | |
Sound Department | |||
| Gilbert Kurland | .... | sound supervisor | |
| Charles Carroll | .... | sound recordist (uncredited) | |
| William Hedgcock | .... | sound recordist (uncredited) | |
Special Effects by | |||
| John P. Fulton | .... | special cinematographer | |
| Raymond Lindsay | .... | special effects (uncredited) | |
Editorial Department | |||
| Maurice Pivar | .... | editorial supervisor (uncredited) | |
Music Department | |||
| C. Bakaleinikoff | .... | conductor (uncredited) | |
| W. Franke Harling | .... | composer: stock music (uncredited) | |
| Clifford Vaughan | .... | orchestrator (uncredited) | |
| Franz Waxman | .... | musical director (uncredited) | |
Other crew | |||
| Carl Laemmle | .... | presenter | |
| Carl Laemmle | .... | president: Universal Productions, Inc. | |
| Alfred Stern | .... | production assistant | |
| Ted Behr | .... | technical advisor (uncredited) | |
| June Blumenthal | .... | secretary to director (uncredited) | |
| Camille Collins | .... | production secretary (uncredited) | |
| Myrtle Gibsone | .... | script clerk (uncredited) | |
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The scientist Janos Rukh (Boris Karloff) has been expelled from the scientific community due to the lack of credibility in his researches. Living isolated in a castle with his blind mother (Violet Kemble Cooper) and his wife Diane (Frances Drake), he makes a private presentation of the recently discovered invisible ray to his colleague Dr. Felix Benet (Bela Lugosi), and succeeds in being sponsored by Sir Francis Stevens (Walter Kingsford) and his wife Lady Arabella Stevens (Beulah Bondi) in an expedition to Nigeria, where he believe he could find a meteor with Radium X. Once in Africa, Janos leaves the expedition alone and finds the meteor, but is exposed to its radiation, acquiring a deadly touch that immediately kills anyone who is touched by him. Meanwhile, Diane falls in love for the son of Lady Arabella, Ronald Drake (Frank Lawton). Dr. Benet finds an antidote to control the effects of the radiation in Janos to be daily injected, but advises that the side effect could bring madness to him. Dr. Benet returns to Paris and steals the findings of Janos, exposing and using Janos's researches to the scientific community, while the deranged Janos seeks revenge against those that have betrayed him.
"The Invisible Ray" is a delightfully silly and naive sci-fi visibly inspired in H.G. Well's "The Invisible Man" of 1933. This minor film is a great opportunity to see Boris Karloff and Bela Lugosi acting together. The story is entertaining but with questionable ethical and moral behaviors of the lead characters. Dr. Felix Benet steals the research of his colleague that needed to recover the esteem together with the scientific community for self-profit and self- promotion. Diane Rukh has an affair with Ronald Drake in the absence of her husband in Africa. Mother Rukh breaks the only chance of survival of her only son that loved her and recovered and healed her vision. And Janos Rukh does not tell his wife that is sick and kills innocent people to reach his personal vendetta. In the end, all the characters are unpleasant. My vote is six.
Title (Brazil): "O Raio Invisível" ("The Invisible Ray")