Dr. Hohner, theatre physician at the Vienna Royal Theatre, murders his mistress, the star soprano when his jealousy drives him to the point of mad obsession. Ten years later, another young singer reminds Hohner of the late diva and his old mania kicks in. Hohner wants to prevent her from singing for anyone but him, even if it means silencing her forever.

Larry Talbot chips Frankenstein's monster out of a block of ice. When Talbot changes to the Wolf Man, the two creatures do battle.

Upon discovering his fiancée Tollea has been kidnaped, Ramu and his friend Kado set out for a Pacific isle where all strangers are to be killed on arrival and the inhabitants, who are frequently sacrificed to an angry volcano god, worship the cobra. The island is ruled over by Tollea's evil twin Naja, the Cobra Woman, who, besides having designs on her new prisoner Ramu, also desires to eliminate any competition from her benevolent sister.

Following a tragic accident that leaves him disfigured, crazed composer Erique Claudin transformed into a masked phantom who schemes to make beautiful young soprano Christine Dubois the star of the opera and wreak revenge on those who stole his music.