The film centers around a serial killer known as "The Card Player", who is kidnapping young women in Rome. Using a webcam set-up, the killer challenges the police by forcing them to play hands of Internet poker. If the police lose, the kidnapped victim is tortured and murdered on-screen. When a British tourist is among the girls murdered, policeman John Brennan (Cunningham) is assigned the case and quickly teams up with Italian detective Anna Mari (Rocca). The duo have their work cut out for them when the Police Chief's daughter (Argento) becomes the killer's latest kidnapping victim.
The film starts as Angela sits on a subway. The train halts and passengers are told to evacuate, as a man has just stepped in front of the tracks and died. While being led out of the station, Angela begins to move towards the tracks to see the man's remains. She is warded away at the last instant. Angela is a university student in Madrid, writing a thesis on audiovisual violence in the family. At a thesis meeting, she asks her thesis director, Figueroa, to help her find the most violent videos in the school's library. After class, Angela seeks out the help of a fellow student, Chema, who is known for his collection of violent and pornographic videos. As Angela begins to watch violent films with Chema, Professor Figueroa finds a tape in a hidden hallway of the school's audiovisual archives. The next day, Angela finds Figueroa dead of apparent heart failure in the university's viewing room, a video tape in the player. Angela takes the tape and leaves for class. She later learns that Figueroa died of an asthma attack, and that a younger professor, Castro, will now be directing her thesis project. Angela goes to Chema's house to watch the stolen film, and Chema realizes that this is a snuff film, or a film of someone actually being murdered. As they watch the women being tortured, killed and disemboweled, Chema realizes that the women in the film was named Vanessa, a girl who attended their university and went missing two years ago. Chema and Angela are also able to determine which kind of camera the killer used, and XT 500, based on the quality of its digital zoom, and that the film was shot in someone's garage.
Max Renn (Woods) is the president of CIVIC-TV, a UHF television station in Toronto that specializes in sensationalistic programming. Displeased with his station's current lineup, Max is looking for something that will break through to a new audience. One morning, he is summoned to the clandestine office of Harlan (Peter Dvorsky), who operates CIVIC-TV's pirate satellite dish which can intercept international broadcasts. Harlan shows him Videodrome, a plotless show apparently being broadcast out of Malaysia which depicts the brutal torture and murder of anonymous victims in a reddish-orange chamber. Believing this to be the future of television (seemingly staged snuff TV), Max orders Harlan to begin pirating the program.
Henry is a drifter who murders scores of people - men, women and children - as he travels through the country. He migrates to Chicago, where he stops at a diner, eats dinner, and kills two waitresses.
The movie begins with Elizabeth logging into a social media site known as "The Den". It is revealed that she is doing this for a project and her goal is to chat with as many strangers as possible. However, things become grim when she starts a chat with someone whose webcam appears to be broken. After having random chats with her, the webcam somehow turns on and a woman is seen being murdered. Throughout this time, Elizabeth's account has also been continuously hacked however she does not realize this. Her friends try to convince her it is a hoax but she remains unconvinced. She asks a friend of hers to hack the account and find out where it is being operated from, but it ultimately doesn't work since the signal is coming from too many locations to be found. Though Elizabeth had contacted the police about the murder, they do not believe her and she remains helpless. Once her boyfriend mysteriously disappears, she panics and calls the police once again. They check his apartment but find it completely empty. Another one of Elizabeth's friends is then shown getting a message from Elizabeth (though it is obviously not actually Elizabeth, as she is with the police). The message tells her friend to come over and she is then shown to be abducted just like Elizabeth's boyfriend. Elizabeth becomes more and more frantic after receiving a message showing a close up of her sister's home and an unknown figure entering it. She calls her sister and tells her to leave, but is too late and her sister and her unborn baby's life is threatened. The attacker then leaves but later returns posing as a police officer. Elizabeth leaves with an officer and contacts her sister once she reaches her apartment to tell her that she will be back with her soon. As Elizabeth is packing she receives another message showing the head detective getting murdered and then another one of her and the inside of her apartment. She goes to open her closet where a hooded figure is, she stabs him repeatedly and flees from her apartment. To her dismay, she is attacked yet again. She later awakens in an unknown building and is chained to a wall. There is a computer in her room on which she receives a video of her boyfriend. He informs her that there are more of them and then is murdered. After overpowering another hooded man in her room she attempts to escape and realizes there are multiple attackers. After finally getting out of the building, she steals a car from one of the attackers but then crashes. Another woman is then seen on the same site Elizabeth was on. She comes across Elizabeth's account where she witnesses Elizabeth being murdered. The scene then cuts to a man putting his credit card number into a site to watch more videos of murders like Elizabeth's but quickly closes the browser when he is interrupted by his young son.
Diane de Monx (Nielsen) is an executive trying to negotiate a deal to acquire the rights to the productions of a Japanese anime studio, which will soon include three-dimensional hentai, for the Volf Corporation. To facilitate the acquisition, she eliminates her superior, Karen (Dominique Reymond), and assumes control of her portfolio, her business partner Hervé (Berling), and her assistant Elise (Sevigny). Elise, however, despises Diane and works to frustrate her negotiations at every opportunity. Diane and Hervé travel to Japan to close the deal, and they enjoy a sexual flirtation which is unfulfilled at that time and seem to grow to like one another.
Ben is a witty, charismatic serial killer who holds forth at length about whatever comes to mind, be it the "craft" of murder, the failings of architecture, his own poetry, or classical music, which he plays with his girlfriend. A film crew joins him on his sadistic adventures, recording them for a fly on the wall documentary. Ben takes them to meet his family and friends while boasting of murdering many people at random and dumping their bodies in canals and quarries. The viewer witnesses these grisly killings in graphic detail.
As a boy, a reclusive and antisocial Sufferton resident, Max Seed, was disfigured in a school bus crash that killed everyone else involved in it. In 1973, Seed began torturing and murdering people, filming some of his victims starving to death in his locked basement, and ultimately racking up a bodycount of 666. In 1979, Seed is arrested by Detective Matt Bishop in a siege that claims the lives of five of Bishop's fellow officers. Seed is sentenced to death by electric chair, and incarcerated on an island prison, where he is a model inmate, only acting out when he kills three guards who try to rape him.
Mark Lewis meets Dora, a prostitute, covertly filming her with a camera hidden under his coat. Shown from the point of view of the camera viewfinder, tension builds as he follows the woman into her home, murders her and later watches the film in his den as the credits roll on the screen.
Cathy, the former star of a reality show similar to "The Bachelor", is now married and living with her husband in the house where the show took place. The house still has several secret rooms and passages, as well as a host of cameras all over the estate.
Semi-retired porn star Miloš (Srđan Todorović) lives with his wife, Marija (Jelena Gavrilović), and six-year-old son, Petar (Luka Mijatović). His brother, Marko (Slobodan Beštić), a corrupt police officer, is attracted to Marija. Marija is curious about her husband's past and is concerned about the family's income. Lejla (Katarina Žutić), a former co-star, offers Miloš a starring role in an art film directed by Vukmir (Sergej Trifunović), an independent pornographer, who wishes to cast Miloš for his powerful erection. Having already caught Petar watching one of his films and unaware of the details of Vukmir's film, Miloš is hesitant to participate and continue his career, but accepts to secure his family's financial future. While meeting Vukmir, Miloš passes a bald man and his entourage, regarding them warily.
Billy (Marina Zudina), an FX make up artist who does not have the physical ability to speak, is in Moscow working on a low budget slasher film directed by her sister's boyfriend Andy (Evan Richards). On one particular night Billy returns to the set to fetch a piece of equipment for the next day's shoot when she is accidentally locked in the studio. Being unable to speak but having the ability to communicate with her sister Karen (Fay Ripley), Billy makes several telephone calls but is interrupted when she discovers a small film crew working after hours to shoot a cheap porno film. Watching unseen Billy is amused until the performed sex becomes sadistic. When a masked actor pulls out a knife and stabs the actress (Olga Tolstetskaya), Billy reacts and is discovered. She flees pursued by the homicidal film crew.
In the near future, big wars are avoided by giving individuals with violent tendencies a chance to kill in the Big Hunt. The Hunt is the most popular form of entertainment in the world and also attracts participants who are looking for fame and fortune. It includes ten rounds for each competitor, five as the hunters and five as the victims. The survivor of ten rounds becomes extremely wealthy and retires. Scenes switch between the pursuit, romance between a hunter and a victim, with a narrator explaining the rules and justification of the Hunt.