Héros de la première guerre mondiale et membre de la SA, le baron von Sepper dissimule ses cicatrices sous sa barbe bleue. Sa dernière jeune épouse, pénétrant dans une chambre-froide que lui a interdit le baron, découvre les cadavres de ses anciennes compagnes. Avant de la tuer à son tour, Barbe Bleue lui conte ses crimes.
While on a camping trip, sheep rancher Dan Logan (Scott) and his son are inadvertently exposed to a secret Army nerve gas from a helicopter passing overhead. Both end up in a military hospital in which they are kept apart, unable to contact outsiders, and lied to about their condition by a mysterious major (Sheen), who looks at the incident as little more than an opportunity to study the effectiveness of a nerve gas on humans.
It's a seemingly idyllic summer in 1935, and identical twins Niles and Holland Perry play around the bucolic family farm. Holland is an amoral mischief maker, though sympathetic Niles is often caught in their shenanigans. Niles carries a Prince Albert tobacco tin with him containing several secret trinkets, including something mysteriously wrapped in blue wax paper, and the Perry family ring, which had been handed down from their grandfather, through their father, to Holland, the older twin. Niles asks Holland to confirm that the ring is now indeed his. "Cripes yes, I gave it to you," is the response. Niles asks Holland to take the ring and the wrapped object back, but Holland insists "I gave them to you, they're yours now." Their obnoxious cousin Russell, whom the boys call "Piggy Lookadoo" behind his back, finds them in the apple cellar below the barn--a place they are not supposed to play--and happens to see the contents of the tobacco tin, including the ring. Russell cryptically states that the ring was supposed to be buried, and promises to "tell on" Niles to his father, Niles' Uncle George. Uncle George padlocks the door to the apple cellar to keep the kids from playing there, but there is another stairway inside the barn, giving them access to the cellar.
The SS Poseidon, an ocean liner slated for retirement and scrapping, makes her way across the Atlantic Ocean and the Mediterranean Sea from New York City to Athens. Despite protests from Captain Harrison, who fears for the ship's safety, the representative of her new owners, Mr. Linarcos, insists that she make full speed towards her destination to save money, preventing her from taking on additional ballast.
The story of Bertha Thompson (played by Barbara Hershey) and "Big" Bill Shelly (played by David Carradine), two train robbers and lovers who are caught up in the plight of railroad workers in the American South. When Bertha is implicated in the murder of a wealthy gambler, the pair become fugitives.
Paul (Belmondo), a former womanizer who marries the head of the medical department's "unattractive" daughter Christine (Farrow) because he thinks attractive women can't be trusted and make poor wives.
In London, a serial killer is raping women and strangling them with neckties. Most of the film takes place in Covent Garden, which at the time was still the wholesale fruit and vegetable market district. Fairly early in the film, the audience sees that fruit merchant Robert Rusk (Barry Foster) is in fact the murderer. However, circumstantial evidence has already built up around his friend Richard Blaney (Jon Finch).
Wealthy housewife and children's author Cathryn (Susannah York) receives a series of disturbing and eerie phone calls in her home in London one dreary night. The female voice on the other end suggests mockingly to her that her husband Hugh (René Auberjonois) is having an affair.
The title character is a vicious villainess who commands a Thought Factory in the Scottish Highlands. Intent on achieving world domination, she kidnaps ex-CIA agent Anthony Lawrence and forces him to help her hijack a secret nuclear weapon, the Polaris submarine.
Norah Benson and her younger brother Joel Delaney attend a party being given by Dr. Erika Lorenz. Joel's girlfriend Sherry appears. Norah is extremely protective of her brother, and it is subtly implied that theirs is not an ordinary siblings' relationship. The siblings have sensibly different, albeit somehow complementary mindsets; in contrast to Norah's upscale, self-compliant snobbishness, Joel is more of an adventurous, bohemian type and frequently goes on trips to exotic locations.
Le commissaire divisionnaire Le Guen, qui a réussi à arrêter le tueur Georges Gassot, se heurte aux méthodes plus modernes de François Tellier, nouveau directeur de la P.J. Gassot s'enfuit de l'hôpital psychiatrique à destination de Marseille où il rencontre une jeune prostituée allemande Gerda. Mais Le Guen, par l'intermédiaire d'un journaliste, fait croire au Milieu que Gassot est à Marseille pour se mettre à la tête de leurs affaires ; le meurtre du souteneur de Gerda, à Marseille, et celui du passeur de Gassot à Marseille laissent croire à cette version. Gassot remonte à Paris, suivi par Le Guen.
En 1930 à Paris, Léon Galipeau, médecin généraliste à la compétence discutable, ausculte Louis Martinet, célibataire de 59 ans. Persuadé que son patient, usé, n'a que deux ans tout au plus à vivre, Galipeau convainc son frère Émile d'acquérir en viager la maison de campagne que possède Martinet dans un petit village de pêcheurs alors méconnu : Saint-Tropez. Confiants dans leur affaire, les deux frères acceptent même d'indexer la rente viagère sur le cours d'une valeur, pensent-ils, sans avenir : l'aluminium.