V/H/S: Viral

• Directed by Marcel Sarmiento
• Written by T.J. Cimfel, David White and Marcel Sarmiento

Kevin, an amateur videographer, constantly shoots footage of his girlfriend Iris. At first, she claims to enjoy it, but then grows annoyed and concerned with her boyfriend's obsession with filming her. It also becomes apparent that Kevin uses his videography as a coping mechanism for living with his abusive grandmother, who at one point bloodies his nose off-screen. Later that night, the high-speed pursuit of an ice-cream truck arrives in his neighborhood. Kevin witnesses the chase as it is broadcast on television, and sees the opportunity to create a viral video. He is too late to shoot footage, watching the truck speed past his house, though he sees Iris wander outside in a daze after receiving a mysterious video call, then disappear when his back is turned. After witnessing the truck run over a cop that had asked him to back away from the road, Kevin chases after the truck, egged on by images of a panicking Iris broadcast to his cell phone. Kevin's continued pursuit of the truck as it repeatedly circles the neighborhood carries on throughout the film, during which people receive strange images on their cell phones that cause them to become violently insane. The film transitions to the first segment.

• Directed and written by Gregg Bishop

This segment is partially framed as an investigative documentary, with interviews of magic experts, theater critics, law enforcement officials, and the main character interspersed throughout the story.

John McMullen, a trailer park resident and untalented illusionist, discovers a cloak that was once owned by Harry Houdini. John discovers that wearing the cloak grants him the power to perform actual magic. Taking on the stage name "Dante the Great", John uses his newfound abilities to perform in front of large audiences, becoming immensely famous. However, John learns that the cloak requires regular human sacrifices to work. To that end, he hires a series of female assistants and videotapes them as he utters an incantation and watches the cloak devour them. He also uses his powers to summon and kill Clay Bowland, the abusive boyfriend of Scarlett Kay, his latest assistant. When Scarlett discovers John's collection of tapes in a secret compartment in his dressing room, she alerts the police, though John is able to use his powers to escape custody. As she is interrogated by a detective, John uses his newfound powers to summon her from the police station. A SWAT team bursts in to arrest John, but John manages to use his magic to kill all of them. He proceeds to duel with Scarlett over the magic cloak. Though Scarlett is briefly able to take it from him, John overpowers her and recovers it. Before John can kill her, Scarlett uses a trick he taught her to immobilize him, prompting the cloak to feed on him instead. Scarlett burns the cloak, only to find it in her house, hanging on her closet door. As she investigates it, a pair of giant, shadowed arms reach out from inside the cloak and grab her.

Returning to the frame story, Kevin and the police continue pursuing the truck. A group of teenagers attempt to film the chase from atop a nearby bridge, with one of them staring at his phone in a trance while his nose bleeds. Another one of the teenagers ends up slipping and falling from the bridge when he gets too close, being run over in the process. Kevin is halted by a group of cyclists, but they end up helping him pursue the truck when one of them is caught on it, has his feet shredded to the bone, and is ultimately killed. Despite this, Kevin continues his mission to save Iris. The film transitions to the next segment.

• Directed and written by Nacho Vigalondo

In Spain, Alfonso, an inventor, works late on his newest project, promising his wife Marta that he will come to bed soon. His project is revealed to be a prototype interdimensional portal. Upon activating the portal, it opens to reveal what appears to be his garage. Alfonso witnesses a copy of himself look at him from the other side, revealing that the portal has successfully opened a gateway to a parallel world. The two versions of Alfonso cautiously greet each other, overcome by curiosity, and discover that they appear to be completely identical. The two agree to trade places, and cross through the portal with their own cameras to explore and document each other's worlds for 15 minutes. As Alfonso explores the alternate version of his house, it would seem that the two worlds are exact mirrored duplicates. Alfonso then encounters the parallel version of Marta, who introduces him to two men both named Oriol. In the living room, a pornographic snuff film plays on the television and a sack of organs is displayed in the center of the room. The parallel Marta prompts Alfonso to perform a ceremony with the Orioles. Disturbed, Alfonso leaves the house and witnesses a large blimp with an inverted cross that blares demonic chanting, revealing that the two worlds hold differing dominant religions. When he attempts to record the blimp, he gets spotted by the two Orioles, who chase Alfonso before catching him. Their eyes and mouth turn bright red, and one of the Orioles takes his pants off to reveal that he has a fanged creature in place of a penis. Back in the normal world, the parallel Alfonso discovers Marta asleep, growing aroused and taking photos of her before unveiling his own monstrous genitalia, scaring Marta awake. In the parallel world, Alfonso manages to stab the Oriol's penis with a screwdriver and flees back to the house, where the parallel Marta takes off her robe to reveal that she has a similarly demonic vagina. Terrified, Alfonso punches her and flees back to his world. The parallel Alfonso, covered in blood after his encounter with Marta, stabs his normal self. The parallel Marta appears and devours the parallel Alfonso with her fanged vagina before the original Alfonso closes the portal. Marta appears, and mistakenly believing that Alfonso attacked her, begins furiously stabbing him as he pleads for her to stop.

Returning to the frame story, Kevin continues to pursue the truck as it continues to circle the neighborhood, begging the police to help him save Iris. Meanwhile, a group of Hispanic gangbangers are holding a barbeque to celebrate one of their own being released from prison. Seeing the police helicopter that has been broadcasting the chase, one of them assumes that his girlfriend has turned him in. Suddenly, the music playing on the radio warps and turns operatic, causing the guest of honor to become violent and murder the others by stabbing them with forks. As the truck and Kevin pass, it is revealed that a gas tank has ruptured in the chaos, causing the party to go up in an enormous fireball. The film transitions to the last segment.

• Directed by Justin Benson and Aaron Scott Moorhead
• Written by Justin Benson

Jason and Danny are a pair of skateboarders in Los Angeles who perform various stunts in the hopes of creating an epic skateboard video. The videographer they hired, Taylor, pushes them into increasingly dangerous circumstances in the hopes that they injure or kill themselves so he can film the aftermath and sell it as a snuff film. After they start a fight at a local skatepark, the skaters become bored. Taylor suggests they continue the film shoot in Tijuana, remembering that he heard about a prime skating location for them to finish their video. Taylor calls out to their friend Shaun, and rope him into joining him in their trip to Mexico by paying for everything with his dad's credit card. After enjoying themselves and buying fireworks, the skaters subsequently become lost and run into a mysterious woman. Once they find a suitable place, an old flood channel, Taylor encourages them to perform more stunts. When one of the skateboarders injures himself and bleeds on a large pentagram drawn on the ground, his blood quickly boils, despite the apparent normal temperature of the pavement on which the pentagram is drawn. The skaters discover the woman they met earlier standing nearby. As Taylor introduces himself and offers to film her, she suddenly tears his arm off. Immediately after, a group of cloaked cultists, who were using the channel as a site for demonic worship, discover the skaters and attack them. The skateboarders manage to kill the cultists, though Taylor is set on fire while Shaun is stabbed by one of the cultists and bleeds out during the fight. As a demonic roar sounds, the dead cultists rise as reanimated skeletons and mount a second attack. During the second attack, Jason and Danny use the fireworks they bought earlier to destroy several of the skeletons. The two proceed to skate back toward the border as the creature the cultists were attempting to summon appears from a storm drain, who picks up and kills the wounded Taylor by eating him along with his camera.

Returning to the frame story, the news broadcasting the chase is warning that several fires have broken out across the city. Kevin still continues to chase the truck, at one point encountering a woman in a trance with her nose bleeding. Kevin tries to get a taxicab to stop, but the driver refuses to. The driver also helps his friend, a porn director, film a striptease with a young woman in the backseat. Suddenly, the woman pulls a gun on him, revealing that the director had previously been sold pornographic footage of her by her ex, and the exposure had apparently ruined her life. She forces him to strip by threatening to shoot his crotch. The director fights back, strangling her, but all three are killed when a police car flips through the air and crushes the taxi. The film transitions to the epilogue.

At dawn, Kevin finally catches up to the truck. He finds it sitting in the empty river basin he had been filming Iris near at the beginning of the film, body parts strewn on the ground around it. He examines the driver's seat only to find it empty, with a pair of disembodied hands duct taped to the wheel. Upon examining the back of the truck, he finds a number of televisions stacked atop each other, as in the first two movies. Iris appears on one of the TV screens and demands that Kevin upload the footage to broadcasters and the internet as well. At first, he refuses, mentioning that the videos are causing people all over the city to go insane, but when Iris begins to brutally mutilate herself, he relents and pushes a button labeled "UPLOAD". With the deed done, he exits the truck as the image of Iris on the screen continues to taunt him. Outside, he discovers Iris, having actually been dead for some time, slumped against the truck with her cellphone stuck in her mouth. Kevin pulls the phone out of her mouth and sees that it is in selfie-mode. He stares in shock at himself on the screen with his nose bleeding. The closing shot of the film, set to the finale from Beethoven's Ninth Symphony, is a view of the Los Angeles skyline, smoke billowing up, lights flickering on and off, and a helicopter circling overhead, revealing the uploaded videos have gone viral and have begun to affect thousands, thus fulfilling the grander threat introduced in the first two films.

• Directed by Todd Lincoln
• Written by Todd Lincoln

A surreal short with no dialogue that follows a sinister, shadowy organization that is tracking a serial killer.
Note: This short was cut at the last minute since it did not fit in with the overall theme of the film. (It was mostly cut due to not being a found-footage film). The short is included as an extra on the film's DVD and Blu-ray release, starting after the credits for the main film end.