Boris Karloff and Bella Lugosi

A young man visits his fiancée's estate to discover that her wheelchair-bound scientist father has discovered a meteorite that emits mutating radiation rays that have turned the plants in his greenhouse to giants. When his own wife falls victim to this mysterious power, the old man takes it upon himself to destroy the glowing object with disastrous results.

Insurance agent-physician collects on policies of men murdered by a disfigured resident of the home for the blind where he acts as doctor-on-call.

Nell Bowen, the protégé of Lord Mortimer, wants to help change the conditions of notorious St. Mary's of Bethlehem Asylum (Bedlam). Though she tries to reform Bedlam, the cruel Master Sims who runs it has her committed there, but ultimately, it's the lunatics who've taken over the asylum.

An Egyptologist returns from the dead to take revenge on those who have violated his tomb.

A mad scientist develops an aftershave lotion that causes his gigantic bats to kill anyone who wears it.

When a nobleman is murdered, a professor of the occult blames vampires, but not all is what it seems.

A wealthy judge coaxes the brilliant but eccentric neurological surgeon Dr. Vollin (Lugosi), who also has an obsessive penchant for Edgar Allen Poe, out of retirement to save the life of his daughter, a dancer crippled and brain damaged in an auto wreck. Vollin restores her completely, but also envisions her as his "Lenore," and cooks up a scheme to kidnap the woman and torture and kill her fiancé and father in his Poe-inspired dungeon. To do his dirty work, Vollin recruits a wanted criminal (Karloff), and turns him into a hideous monster to guarantee his subservience.

Mad scientist Dr. Henryk Savaard is obsessed with bringing the dead back to life. The police are alerted to Savaard's activities, however, and Savaard is arrested, convicted, and sentenced to hang. He vows revenge on the judge, jury, and district attorney. After the hanging, his assistant claims the corpse and uses Savaard's technique to bring the doctor back to life. Now the mad scientist can seek sweet revenge on his perceived enemies

A wealthy industrialist hires the renowned hoax-buster Phillip Knight to prove that an island he plans to develop isn't voodoo cursed. However, arriving on the island, Knight soon realizes that voodoo does exist when he discovers man-eating plants and a tribe of natives with bizarre powers.

A gang of racketeers frames down-on-his-luck John Ellman for murder. After a trial finds him guilty, evidence is brought forth proving his innocence, but it is too late and he is executed anyway. A doctor sees an opportunity to use an experimental procedure to restore him to life but is that entirely possible? ....Or desirable?