William Sylvester

A young couple inherits an old mansion inhabited by small demon-like creatures who are determined to make the wife one of their own.

A secret vampire cult, which has its headquarters beneath the town cemetery, searches for victims for its human sacrifice rituals.

An evil hyponotist/ventriloquist plots to gain an heiress’ millions.

When an undersea volcano sends tremors throughout the Atlantic, aquatic creatures come out of hiding. Merchant seamen Joe Ryan and partner Sam ...