A screwy professor's experiments with a gorgeous model attract the attentions of a gangster and a handsome millionaire.
A scientist (Bela Lugosi) seeks an antidote for a radium-poisoned colleague (Boris Karloff) with the touch of death.
A criminal (Jon Hall) haunts his enemies' mansion after a mad scientist (John Carradine) makes him invisible.
Shepherd Ygor (Bela Lugosi) rescues the monster (Lon Chaney) from a sulfur pit and brings him to Dr. Frankenstein's other son (Cedric Hardwicke).
Rebellious teen Amy (Elizabeth Berridge) defies her parents by going to a trashy carnival that has pulled into town. In tow are her boyfriend, Buzz (Cooper Huckabee), and their friends Liz (Largo Woodruff) and Richie (Miles Chapin). Thinking it would be fun to spend the night in the campy "Funhouse" horror ride, the teens witness a murder by a deformed worker wearing a mask. Locked in, Amy and her friends must evade the murderous carnival workers and escape before it leaves town the next day.
When famous radio hypnotist Alex Gregor (Lon Chaney Jr.) accidentally causes the death of an audience member during a broadcast, his guilt leads him to break off his engagement to Maura Daniel (Evelyn Ankers) and take a job at a wax museum. Jealousy over the attention paid to his new co-worker causes mentally unbalanced sculptor Rudi Poldan (Martin Kosleck) to lash out at museum owner Valerie Monet (Tala Birell) and her niece Nina (Elena Verdugo) in a horrifying fashion.
Desert scientists (John Agar, Mara Corday, Leo G. Carroll) try to stop a fortified spider the size of a building.
Short on cash, undergrad David Blake (Dirk Benedict) takes a job working as a lab assistant for snake expert Dr. Carl Stoner (Strother Martin). When Stoner begins giving David a series of antibiotics as a safeguard against snakebites, he at first thinks nothing of it. But gradually David begins to notices curious changes in his body, and his new girlfriend, Dr. Stoner's daughter, Kristina (Heather Menzies), notices them too. Could Dr. Stoner really be trying to turn his assistant into a snake?
Florida aquarium workers (John Agar, Lori Nelson, John Bromfield) communicate by cattle prod with a captured gill-man.
Composer Lord Ambrose D'Arcy (Michael Gough) and his backer, Harry Hunter (Edward De Souza), struggle to find a replacement for the female lead in their new opera after she quits in the wake of a gruesome murder. When a new prospect, the nubile Christine Charles (Heather Sears), disappears, Harry cautiously investigates. Meanwhile, a mysterious masked man (Herbert Lom) who is eerily familiar with the opera holds Christine captive and offers to groom her to play the part.
Talented Christine (Susanna Foster) is unaware that her singing lessons are being funded by a secret admirer, Enrique (Claude Rains), a mysterious violinist with a disfigured face. Christine's colleagues become suspicious when mysterious accidents start occurring at the Paris Opera House, as the deaths coincide with her meteoric rise to stardom. Christine's suitors, Raoul (Edgar Barrier) and Anatole (Nelson Eddy), brave the dark recesses of the opera house to find the true culprit.
A man (Lionel Atwill) uses mind over matter to replace his legs, then hunts the doctors who took them.
Pirate Captain Clegg (Peter Cushing), an English vicar by day, leads ghostly mounted smugglers by night.
While looking through his telescope one night, John Putnam (Richard Carlson) sees what at first appears to be a meteor shower -- but it is actually a crash-landing alien spaceship! After investigating the crater from the impact, John informs the town sheriff (Charles Drake), and receives nothing but ridicule. Even his fiancée, Ellen (Barbara Rush), is skeptical. All that changes when the townsfolk start disappearing, and are replaced by eerie alien duplicates.
In this adaptation of H.G. Wells' novel "The Island of Doctor Moreau," Edward Parker (Richard Arlen) is shipwrecked on a remote island presided over by the mysterious Dr. Moreau (Charles Laughton). Edward discovers his host is conducting genetic experiments, and presiding over a race of half-human, half-animal hybrids, including the alluring Panther Woman and the sage Sayer of the Law (Bela Lugosi). The island has become its own society, with Moreau as its god.
An insane sculptor sends the disfigured criminal he saved from drowning to kill the critics who denounced him.
After escaping from prison, the evil Dr. Niemann (Boris Karloff) and his hunchbacked assistant, Daniel (J. Carrol Naish), plot their revenge against those who imprisoned them. For this, they recruit the powerful Wolf Man (Lon Chaney), Frankenstein's monster (Glenn Strange) and even Dracula himself (John Carradine). Niemann pursues those who wrong him, sending each monster out to do his dirty work. But his control on the monsters is weak at best and may prove to be his downfall.
This monster movie focuses on the iconic vampire, Count Dracula (John Carradine), and Lawrence Talbot (Lon Chaney), better known as the Wolf Man. Both beings of the night are tired of their supernatural afflictions, so they seek out Dr. Franz Edelmann (Onslow Stevens) for cures for their respective curses. While trying to aid the imposing creatures, Edelmann himself develops a transformative condition, adding to the many ghouls lurking around the foreboding landscape.
Dr. Frankenstein (Peter Cushing) returns destitute to his home village to recommence his experimental research into the reanimation of dead tissue, and stumbles upon his old monster suspended in ice. Though he revives the creature, Frankenstein must seek the help of hypnotist Zoltan (Peter Woodthorpe) to repair its mind. Zoltan then assumes control of the monster, using him to wreak havoc. But when Frankenstein tries to regain power over his creation, he becomes Zoltan's next target.
Although Count Dracula was destroyed by Van Helsing (Edward Van Sloan), who is now being tried for his murder, Dracula's daughter, the Countess Marya Zaleska (Gloria Holden), is still alive -- and her father's death has brought her no closer to eradicating her vampiric thirst for blood. When attempts to free herself of the disease fail, she turns to psychiatrist Dr. Garth (Otto Kruger) for assistance, but soon finds herself struggling with the desire to make him one of the undead as well.