The production was directed by Harry Lachman and is a B movie with both mad scientist and monster themes.

Dr. Forbes learns from the innkeeper that a storm has washed out the bridge to Renault's house and he ends up spending the night at the inn.

There he meets most of the film's main characters including Dr. Renault's strangely deformed man servant, Noel (J. Carrol Naish).

There he finds a book detailing the experiments Dr. Renault carried out to transform Noel from an ape into a man.

In the closing sequence, Madeline is abducted by her gardener, an ex-convict named Rogell (Mike Mazurki), and Noel pursues them.