In 1840s London, Dr. Thomas Bolton [Boris Karloff] dares to dream the unthinkable: experimenting with anesthesia gases to make surgery pain-free. While doing so, his demonstration before a panel of his peers ends in a horrific mishap with his patient awakening under the knife; he is forced to leave his position in disgrace. To complicate matters, he becomes addicted to his own chemical experiments and gets involved with a criminal gang led by Black Ben [Francis de Wolff], and a ruthless killer Resurrection Joe [Christopher Lee]. Unfortunately, this shady partnership leads Dr. Bolton to further ruin, culminating in his unwitting participation in murder — for which he becomes the first victim of a blackmail scheme.

A year after Sheila is killed in a hit-and-run, her multimillionaire husband invites a group of friends to spend a week on his yacht playing a scavenger hunt-style mystery game—but the game turns out to be all too real and all too deadly.

A plastic surgeon and his nurse join a bizarre circus to escape from the police. Here he befriends deformed women and transforms them for his "Temple of Beauty". However, when they threaten to leave, they meet with mysterious accidents.

An evil hyponotist/ventriloquist plots to gain an heiress' millions.

When singer Guy Lambert goes on tour in Europe, he is pursued by two beautiful women, bumbling jewel thieves, and a mysterious killer.

A captain and his sailors investigate the rampaging "Marsh Phantoms" terrorizing a coastal town, but their search is hindered by a local reverend and a horrifying curse.

A small time thief is recruited by a mobster to help with the racketeering. He doesn't like the job, but with the mob on his back, a femme fatale in his bed and a sick friend to care for, he will have to keep all his wits about him.

1880. British India. Robert Case, a half-caste lieutenant, is unjustly discharged from the British Army. He joins the rebel Bengali tribesmen offensive against the colonial enemy. They capture a foreign journalist and Case recounts his story of false accusation on trumped-up charges, instigated by the bigotry and racism of his commanding officers. Following a successful attack by the British against the rebels Case is brutally shot by Colonel Drewe, his accuser. The journalist returns home determined to report the true story of The Brigand of Kandahar.

An authoress writes a steaming sex-novel and proceeds to live out her heroine's adventures.

A fastidious insurance assessor investigates a potential case of insurance fraud.