Baron Frankenstein is blackmailed by Dr. Praetorious into reviving his monster and building a mate for it.

In the upper reaches of the Amazon River, a scientific team discovers an amphibious creature, a living missing link. The creature is captured and falls in love with the female assistant of the leader of the research team. The lonely creature kidnaps her, and the scientist mounts an effort to reclaim his sweetheart and return the creature to his watery home.

A melodrama about a strange man who lives in the catacombs below the Paris Opera House and his love affair with an opera starlet whom he tutors.

Count Dracula heads to London to search for victims.