Dracula, Prisoner of Frankenstein (1972)

Baron Victor Frankenstein has discovered life's secret and unleashed a blood-curdling chain of events resulting from his creation: a cursed creature with a horrid face — and a tendency to kill.

Famed monster slayer Gabriel Van Helsing is dispatched to Transylvania to assist the last of the Valerious bloodline in defeating Count Dracula. Anna Valerious reveals that Dracula has formed an unholy alliance with Dr. Frankenstein's monster and is hell-bent on exacting a centuries-old curse on her family.

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 his daughter. Receiving little help from the law, Professor Zelen, an expert in the occult, is called in to assist with their investigation.

After Jonathan Harker attacks Dracula at his castle, the vampire travels to a nearby city, where he preys on the family of Harker's fiancée. The only one who may be able to protect them is Dr. van Helsing, Harker's friend and fellow-student of vampires, who is determined to destroy Dracula, whatever the cost.

A countess from Transylvania seeks a psychiatrist’s help to cure her vampiric cravings.

A British estate agent travels to Transylvania to meet the mysterious Count Dracula, who is interested in leasing a London castle. After Dracula enslaves the agent and drives him to insanity, the pair return to London together, where Dracula, a secret bloodsucker, begins preying on socialites.

A child conceived by a mute servant girl transforms from an innocent youth to a killer beast at night with uncontrollable urges.

A man and wife are terrorized by Mad Scientist Dr. Callistratus who was executed but has returned to life with a heart transplant. Along with his crippled assistant Carl, the 'anemic' Mad Scientist, believed to be a vampire, conducts blood deficiency research on the inmates of a prison hospital for the criminally insane to sustain his return to life.

A brilliant but deranged neurosurgeon becomes obsessively fixated on a judge's daughter. With the help of an escaped criminal whose face he has surgically deformed, the mad man lures her, her father, and her fiancé to his isolated, castle-like home.

When Darren Shan is taken to a circus that's chock-full of sideshow oddities, he meets a vampire and receives a life-changing bite on the neck.