The First Purge is the fourth movie in The Purge franchise, the film is a prequel depicting the origins of the first annual "Purge", a 12-hour period in which all crime in America is legal.
A crazed drug addict named Skeletor talks on camera about his dark thoughts, including his desire to "purge" and unleash his hatred on other people. An unknown voice on the other end of the camera tells Skeletor he will be able to soon do that.
Sometime in the mid-21st century, turmoil has caused the government to be overthrown by the New Founding Fathers of America (NFFA). NFFA members Arlo Sabian and Dr. May Updale announce an experiment to take place on Staten Island where for 12 hours, citizens will be allowed to purge and release their inhibitions in any way they choose. The NFFA offers residents of the Island $5000 to stay in their homes during the experiment and a compensation for those participating as well. They also outfit the participants with tracking devices and contact lenses with cameras in them so that they can monitor all activity. Drug lord Dmitri tells his dealers that they will be leaving but drug dealer Capital A wants to stay and purge. Another drug dealer, Isaiah, gets into a fight with Skeletor and gets his neck cut. Isaiah goes to his sister Nya for treatment, and Nya later confronts Dmitri as she believes that Dmitri is Isaiah's drug lord, which he denies.
As people flee Staten Island on the night of the experiment, Nya joins her friends Dolores, Luisa and Selina in a church to wait out the Purge. Dmitri has stayed behind because Capital A has sent two hookers to his office. Skeletor commits the first-ever murder during the Purge, and the video recorded by the NFFA goes viral. The NFFA also observe that more parties than killings are taking place. Isaiah confronts Skeletor during the Purge but cannot shoot him. Skeletor chases Isaiah throughout the streets but Isaiah manages to hide and he calls Nya to help. Dmitri's hookers are revealed to be Purgers who attempt to kill him, but Dmitri fights them off and learns that Capital A had sent them in an attempt to take over Dmitri's business. Skeletor captures Nya in the streets and attempts to rape her, but Isaiah stabs him in the back and they escape.
Nya and Isaiah return to the church to see blood-soaked Purgers leaving it. They discover that Luisa and Selina survived, but Dolores' fate is unknown. They all return to Isaiah's apartment where Dolores has made it safely. At the NFFA headquarters, Updale is reviewing video footage of the Purge when she sees trained mercenary groups killing multiple civilians, including the ones at the church earlier. Sabian explains that he sent the mercenaries to help "balance" the rich and the poor. He then has Updale taken to a neighborhood where she is killed, and he erases all footage of the event.
Capital A goes to Dmitri's office to see the results of his hookers' efforts, but Dmitri and his gang kill Capital A. Dmitri and his gang escape through the streets, killing multiple Purgers along the way, until NFFA drones shoot and kill Dmitri's gang. Dmitri calls Nya and warns her that the mercenaries are coming toward her apartment. Dmitri makes his way to the apartment, killing more mercenaries along the way. The mercenaries are about to shoot a rocket-propelled grenade into the apartments when Skeletor arrives and kills some mercenaries before he himself is killed. Dmitri grabs a piece of C-4, throws it and shoots it repeatedly until it explodes, killing the remaining mercenaries. As sirens sound the end of the Purge, Dmitri is hailed as a hero, and he states that the survivors must somehow fight back.
During the end credits, Sabian reads a statement calling this experimental Purge a success, and that a nationwide Purge may begin as soon as the following year.
- Y'lan Noel as Dmitri
- Lex Scott Davis as Nya
- Joivan Wade as Isaiah
- Mugga as Dolores
- Christian Robinson as Capital A
- Lauren Velez as Luisa
- Kristen Solis as Selina
- Marisa Tomei as Dr. May Updale/The Architect
- Patch Darragh as Aldo Sabian/Chief of Staff
- Maria Rivera as Anna
- Chyna Layne as Elsa
- Siya as Blaise
- Melonie Diaz as Juani
- Mo McRae as 7 & 7
- Steve Harris as Freddy
- Rotimi Paul as Skeletor