Dr. Janos Rukh discovers a certain type of radium that has almost magical healing properties. But the element has a dangerous side, too, and it has already started affecting Rukh. Consumed by paranoia, he begins to suspect that his wife is having an affair. Wild for revenge, Rukh hatches a deadly plot...using his own poisoned body as a weapon to kill.
Directed by Lambert Hillyer
telescope
paris, france
love triangle
africa
insanity
meteor
radium
revenge
laboratory
scientist
fake death
dead dog
killing a dog
regaining sight
Trailer
IMDB
N/A
Letterboxd
3.1 / 5
Where to Watch
Cast
Boris Karloff
Dr. Janos Rukh
Bela Lugosi
Dr. Felix Benet
Frank Lawton
Ronald Drake
Frances Drake
Diana Rukh
Violet Kemble Cooper
Mother Rukh
Beulah Bondi
Lady Arabella Stevens
Walter Kingsford
Sir Francis Stevens
Paul Weigel
Monsieur Noyer
Frank Reicher
Professor Meiklejohn
Georges Renavent
Chief of the Surete
May Beatty
Mme. LeGrand (uncredited)
Paul McAllister
Papa LaCosta (uncredited)
Crew
Lambert Hillyer
Director
Franz Waxman
Original Music Composer
Jack Pierce
Makeup Artist
Otto Lederer
Makeup Artist
Howard Higgin
Original Story
Albert S. D'Agostino
Art Direction
Popular Reviews
8 reviews
christy
5.0★ · 08/23/25
Very misleading title. There are no invisible rays. Only glow in the dark Boris Karloff. It's also painfully boring and not very good. Everything went downhill after they went to Africa.
Very misleading title. There are no invisible rays. Only glow in the dark Boris Karloff. It's also painfully boring and not very good. Everything went downhill after they went to Africa.
Lance
4.7★ · 07/27/25
cunty foreword and not exactly a very captivating story to back it up which is a little trend i'm noticing with these types of movies for some reason (see: my review for frankenstein) but at least frankenstein was a bit more charming and had something to say (and isn't a flop 😭🙏)
getting THEEEEEEE bela lugosi and boris karloff to star in your movie and making it unappealing and uncharming is truly hard work and it's a feat that hillyer managed to pull off
janos rukh did nothing wrong especially for wanting to kill that guy that stole his wife while he was out making a world changing scientific discovery like trust me i would do so much worse
the invisible man solos the invisible ray
cunty foreword and not exactly a very captivating story to back it up which is a little trend i'm noticing with these types of movies for some reason (see: my review for frankenstein) but at least frankenstein was a bit more charming and had something to say (and isn't a flop 😭🙏)
getting THEEEEEEE bela lugosi and boris karloff to star in your movie and making it unappealing and uncharming is truly hard work and it's a feat that hillyer managed to pull off
janos rukh did nothing wrong especially for wanting to kill that guy that stole his wife while he was out making a world changing scientific discovery like trust me i would do so much worse
the invisible man solos the invisible ray
rivercitykiiid
3.8★ · 08/09/23
1) Karloff saying “Nothing’s happened to me! What makes you think something’s happened to me?!” while his ass is sitting there literally GLOWING IN THE DARK was so funny 😭
2) Bela should have always had that mustache van dyke combo omg so handsome
3) WELCOME HOME CHEATER @ Diana (Frances Drake)
4) were Carparthia/Carpathian Mountains just A THING in the 30s? like were they just looming large in the popular consciousness??
5) Janos is a tragic figure he didn’t do anything wrong idk
1) Karloff saying “Nothing’s happened to me! What makes you think something’s happened to me?!” while his ass is sitting there literally GLOWING IN THE DARK was so funny 😭
2) Bela should have always had that mustache van dyke combo omg so handsome
3) WELCOME HOME CHEATER @ Diana (Frances Drake)
4) were Carparthia/Carpathian Mountains just A THING in the 30s? like were they just looming large in the popular consciousness??
5) Janos is a tragic figure he didn’t do anything wrong idk
