Keir Gilchrist, Daniel Zovatto, Jake Weary, Olivia Luccardi, and Lili Sepe appear in supporting roles.

She wakes up tied to a wheelchair, where Hugh explains that he has passed something to her through intercourse – she will be pursued by an entity that only they can see, which can take the appearance of any person.

Hugh waits until a naked woman slowly approaches them to prove Jay is being followed, then urges her to have sex with someone else soon.

With the help of their neighbor, Greg, the group discovers Hugh's real name, Jeff Redmond, and find his home.

Jeff explains that the entity began pursuing him after a one-night stand, and reiterates that the only option is to sleep with someone else and implore them to do the same.

The next day on the lakefront, while Greg leaves to pee, the entity arrives in the form of Yara and attacks Jay from behind by grabbing her hair, which is witnessed by her friends.

The group plans a last ditch effort to kill the entity by luring it into a swimming pool and dropping electrical devices into the water.

Firing at an invisible target, Paul accidentally wounds Yara but shoots the entity twice before it falls into the pool.

Featured as forms of the entity are Ingrid Mortimer, Alexyss Spradlin, Mike Lanier, and Don Hails.

[12] The film's monster, shot composition and overall aesthetic were influenced by the work of contemporary photographer Gregory Crewdson.

Director of photography Mike Gioulakis said: "We're both big fans of the still photographer Gregory Crewdson and David had him in his look book from day one.

The critical consensus states: "Smart, original and, above all, terrifying, It Follows is the rare modern horror film that works on multiple levels – and leaves a lingering sting.

"[26] On review aggregator website Metacritic, the film has an average rating of 83 out of 100, based on 37 critics, indicating "universal acclaim".

[28][9] Peter Debruge of Variety gave an overall positive review, saying: "Starting off strong before losing its way in the end, this stylish, suspenseful chiller should significantly broaden Mitchell's audience without disappointing his early supporters in the slightest.

"[29] David Rooney of The Hollywood Reporter said, "Creepy, suspenseful and sustained, this skillfully made lo-fi horror movie plays knowingly with genre tropes and yet never winks at the audience, giving it a refreshing face-value earnestness that makes it all the more gripping.

"[30] Tim Robey of The Daily Telegraph gave the film five out of five stars and said, "With its marvellously suggestive title and thought-provoking exploration of sex, this indie chiller is a contemporary horror fan's dream come true.

Club said, "Despite all the fun-to-unpack ideas swirling around Mitchell's premise, this is first and foremost a showcase for his considerable talents as a widescreen visual stylist, which are most apparent in the movie's deftly choreographed, virtuoso 360° pans.

[40] Quinn has expressed the idea of flipping the concept of the first film around, with Jay or another protagonist going down the chain to find the origin of "it.

"[41] On October 30, 2023, it was announced that a sequel, entitled They Follow, was in pre-production with writer-director David Robert Mitchell and star Maika Monroe returning.

[42] In October 2015, at the beginning of an episode of The Good Wife, after being threatened by a political rival that "I will destroy you and everything you hold dear," campaign manager Eli Gold responds, "Have you seen the movie 'It Follows'?"

In the 2016 novel Desolation by Derek Landy, the premise which follows individuals as they travel a titular "demon road" on which exists all manner of supernatural beings from whom all horror fiction antagonist creators were subconsciously inspired by to create (primarily the villains of the works of Stephen King and 1980s slasher film villains, as well as "real" versions of the Scooby-Doo gang), "IT" is featured as a parody composite character of the "IT" of It Follows and the "IT" of the self-titled novel and its adaptations, depicted as a slow-moving demonic clown who can only be seen by teenagers and children below the age of 18, whom the protagonists Amber and Milo encounter over the course of one of several semi-anthological subplots.

[44] The 2022 season premiere of the fourth and final season of the FX satirical surrealist comedy-drama series Atlanta, entitled "The Most Atlanta", features an It Follows-inspired subplot in which the holder of an air fryer is constantly pursued by a woman on a slow-moving mobility scooter for days (also inspired by a real-life woman in a wheelchair who had confronted looters with a knife during George Floyd protests in Minneapolis).