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.
During World War II, a small plane somewhere over the Caribbean runs low on fuel and is blown off course by a storm. Guided by a faint radio signal, they crash-land on an island. The passenger, his manservant and the pilot take refuge in a mansion owned by a doctor. The quick-witted yet easily-frightened manservant soon becomes convinced the mansion is haunted by zombies and ghosts.
Dr. Paul Carruthers is frustrated because he thinks his employers, Mary Heath and Henry Morton, have cheated him out of the company's profits. He decides to get revenge by altering bats to grow twice their normal size and training them to attack when they smell a perfume of his own making. He mixes the perfume into a lotion, which he offers as a gift to Mary and Henry. When they turn up dead, a newspaper reporter decides to investigate.
A couple of young, out-of-work archaeologists in Egypt discover evidence of the burial place of the ancient Egyptian princess Ananka. After receiving funding from an eccentric magician and his beautiful daughter, they set out into the desert only to be terrorized by a sinister high priest and the living mummy Kharis who are the guardians of Ananka’s tomb.
Dr. John Garth conducting an innovative medical experiment aimed at prolonging life and combating aging. The experiment takes an unexpected turn, placing the doctor in a confrontation with the ethics of his work and the consequences of his research.
Dr. Leon Kravaal develops a potential cure for cancer, which involves freezing the patient. But an experiment goes awry when authorities believe Kravaal has killed a patient. Kravaal freezes the officials, along with himself. Years later, they are discovered and revived in hopes that Kravaal can indeed complete his cure. But human greed and weakness compound to disrupt the project.
Paris, France, 1482. Frollo, Chief Justice of benevolent King Louis XI, gets infatuated by the beauty of Esmeralda, a young Romani girl. The hunchback Quasimodo, Frollo's protege and bell-ringer of Notre Dame, lives in peace among the bells in the heights of the immense cathedral until he is involved by the twisted magistrate in his malicious plans to free himself from Esmeralda's alleged spell, which he believes to be the devil's work.
When news reporter Walter Garrett arrives at the hotel room of bombshell actress Angela Merrova to conduct an interview, he finds her dead from multiple stab wounds. He returns with the police to find the hotel empty and the body vanished. Garrett writes about the incident but is fired when Merrova, alive and well, goes to the paper to complain. Now his only chance to get his job back is to find the truth, which involves the grisly scheme of a madman.
Dr. Henryk Savaard is a scientist working on experiments to restore life to the dead. When he is unjustly hanged for murder, he is brought back to life by his trusted assistant. Re-animated he turns decidedly nasty and sets about murdering the jury that convicted him.
On his uncle's death Sir Henry Baskerville returns from Canada to take charge of his ancestral hall on the desolate moors of Devonshire, and finds that Sherlock Holmes is there to investigate the local belief that his uncle was killed by a monster hound that has roamed the moors since 1650, and is likely to strike again at Sir Henry.
One of the sons of late Dr. Henry Frankenstein finds his father's ghoulish creation in a coma and revives him, only to find out the monster is controlled by Ygor who is bent on revenge.
Wrongfully convicted of a robbery and murder, Paul Lavond breaks out of prison with a genius scientist who has devised a way to shrink humans. When the scientist dies during the escape, Lavond heads for his lab, using the shrinking technology to get even with those who framed him and vindicate himself in both the public eye and the eyes of his daughter, Lorraine. When an accident leaves a crazed assistant dead, however, Lavond must again make an escape.
In a 16th-century European town, the ruling family has been given a prophecy that, should there ever be twin boys born, the younger will murder the older; so is dismayed when twins are born to the popular baron. The older grows to be a selfish, slovenly man, who inherits the castle at his father's death and becomes ruler over the formerly happy villagers. He enjoys his power until he learns his younger brother is returning from abroad and, afraid of the prophecy, he determines to murder his sibling, hide his body in the "black room" - an old torture chamber sealed away behind the fireplace - and then impersonate him, right down to his withered arm. In this way he hopes to not only avoid the prophecy, but also escape consequences of his other criminal deeds and obtain marriage to a local girl of the nobility...
An insane surgeon's obsession with an actress leads him to replace her wounded pianist husband's hands with the hands of a knife murderer--hands which still have the urge to throw knives.
Sir Borotyn, a prominent Prague resident, is discovered murdered in his home, with all indications pointing to a vampire assault. The victim's friend, Baron Otto, and the physician who analyzes the body are certain that the vampire is the mysterious Count Mora, or perhaps his daughter, but receive little help from the law. Professor Zelen, an expert in the occult, is called in to assist with the investigation.