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")
