Losing his memories of the last few days, neurologist Dr. Steele is told that his wife has been brutally murdered. Steele, aware of his conniving wife's infidelity, believes he may have been the killer and enlists the aid of his pretty nurse Stella to hypnotize him into recovering his lost memories.
Captain Stone's newly recruited officer, Tom Merriam, idolizes his senior who treats him like a friend. But when a couple of his crew members die mysteriously, Tom starts doubting Stone's authority.
A university chemistry professor experiments with an ancient Mayan gas on a medical student, turning the would-be surgeon into a murdering ghoul as part of a plan to steal his lover.
In 1918, an English family is terrorized by a vampire, until they learn how to deal with it. They think their troubles are over, but German bombs in WWII free the monster. He reclaims the soul of his wolfman ex-servant, and assuming the identity of a scientist who has just escaped from a concentration camp, he starts out on a plan to get revenge upon the family.
Carpathian Count Alucard is invited to the U.S. by a young heiress. Her boyfriend and local officials are suspicious of the newcomer, who is interested in the "virile" soil of the new world.
During WWII several murders occur at a convalescent home where Dr. Watson has volunteered his services. He summons Holmes for help and the master detective proceeds to solve the crime from a long list of suspects including the owners of the home, the staff and the patients recovering there.
After young Mary Gibson discovers that her older sister Jacqueline has disappeared, she leaves her boarding school and heads to New York City to track down her sibling. But Mary gets drawn deeper into the mystery.
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.
Grave robbers open the grave of the wolf man and awaken him. He doesn't like the idea of being immortal and killing people when the moon is full so tries to find Dr. Frankenstein, in the hopes that the doctor can cure him. Dr. Frankenstein has died; however, his monster is found.
A Serbian émigré in Manhattan believes that, because of an ancient curse, any physical intimacy with the man she loves will turn her into a feline predator.
A high priest of Karnak travels to America with the living mummy Kharis (Lon Chaney Jr.) to kill all those who had desecrated the tomb of the Egyptian princess Ananka thirty years earlier.
England, at the start of World War Two. Mysterious wireless broadcasts, apparently from Nazi Germany are heard over the BBC. They warn of acts of terror in England, just before they take place. Baffled, the Defense Committee call in Sherlock Holmes.
Frankenstein's unscrupulous colleague, Dr. Bohmer, plans to transplant Ygor's brain so he can rule the world using the monster's body, but the plan goes sour when he turns malevolent and goes on a rampage.
After his brother's death, Larry Talbot returns home to his father and the family estate. Events soon take a turn for the worse when Larry is bitten by a werewolf.
Dr. Jekyll believes good and evil exist in everyone and creates a potion that allows his evil side, Mr. Hyde, to come to the fore. He faces horrible consequences when he lets his dark side run amok.