Plot

One year after the supernatural nightmare at Freddy Fazbear's Pizza, Abby runs away to reconnect with her animatronic friends, uncovering dark secrets about the true origins of Freddy's and unleashing a horror hidden for decades.

One year has passed since the supernatural nightmare at Freddy Fazbear's Pizza. The stories about what transpired there have been twisted into a campy local legend, inspiring the town's first ever Fazfest. Former security guard Mike (Josh Hutcherson) and police officer Vanessa (Elizabeth Lail) have kept the truth from Mike's 11-year-old sister, Abby (Piper Rubio), concerning the fate of her animatronic friends. But when Abby sneaks out to reconnect with Freddy, Bonnie, Chica, and Foxy, it will set into motion a terrifying series of events, revealing dark secrets about the true origin of Freddy's, and unleashing a long-forgotten horror hidden away for decades.

When Mike Schmidt's eleven year old sister named Abby tries to reconnect with Freddy Bonnie, Chica, Foxy and the mysterious Yellow bear things go more nightmarish and supernatural the animatronics don't recognize Abby for some reason and Mike gets a call for another job at another Freddy's pizzeria which meant Mike and Abby must survive five nights all over again by checking cameras vents and winding the Puppets music box and by using the Freddy mask to fool the animatronics facial recognition systems, but Mike and Abby aren't the ones to shy away from survival, especially with officer Vanessa on their side, will they survive or will they die—PioG-9

In 1982, at Freddy Fazbear's Pizza, Charlotte Emily witnesses a boy being lured into the backroom by the restaurant's founder and serial killer, William Afton. Despite her pleas for assistance being ignored by the adults present, she ventures into the back and sees Afton attempting to murder the boy. As she carries the boy back to the main stage, she is stabbed in the back by Afton just as she reappears. After a scream of anguish directed at the customers, she succumbs to her wounds. Shortly thereafter, a puppet-like animatronic known as the Marionette emerges from its compartment holding Charlotte's corpse. Following the incident, the location shuts down, although a new location opens up shortly after.

Twenty years later, in 2002, and a year after the events of the first film, the animatronics' stories and related murders have turned into folklore, leading to a recurring local festival known as FazFest. Vanessa, William's daughter, copes with psychological trauma from her father's acts. Meanwhile, Abby, Mike's younger sister, becomes fascinated with the animatronics, whom she calls her "friends." After being bullied, she attempts to repair the animatronics, discovering the likely absence of the souls within them. Mike eventually gives her a keepsake-a talking toy called the FazTalker-and notices a pamphlet with a phone number at Freddy's as they leave.

In the paranormal investigation show Spectral Scoopers, hosts Rob, Lisa, and Alex visit the site of the 1982 incident, accompanied by former security guard Michael. During an independent exploration, Lisa deactivates a music box in the basement, which awakens the Marionette possessed by Charlotte's soul. The Marionette then manipulates the new "Toy" animatronic mascots, leading to the deaths of the three hosts and Lisa's possession by the Marionette. The Marionette attempts to kill Michael, who narrowly escapes. Meanwhile, Abby, using her FazTalker, hears from Toy Chica, who directs her to the original location with an offer to repair her science project. The following day, Abby reveals her completed project to Mike and Vanessa. Vanessa becomes concerned as Abby discusses details of the location's history, including Charlotte's murder. However, Mike, already informed after calling Charlotte's father Henry, dismisses Vanessa's explanation, believing she is still suffering from her father's trauma.

Mike drops Abby off at school and visits Henry, who is distributing flyers about his daughter's murder. Meanwhile, Vanessa is captured by Charlotte while trying to return to the original location. After Abby's teacher Mr. Berg breaks her science project, Abby seeks assistance from Toy Chica, who will pose as her project if Abby inputs a code. This code allows the animatronics to leave their area. The Toy animatronics begin exploring the town, with Toy Chica accompanying Abby to the science fair and murdering Mr. Berg. Mike, after learning from Abby's school that she is missing, realizes she might be at the original location and heads there. Shortly after being released, the Toy animatronics wreak havoc across the town, attempting to kill multiple families in their homes. Attempting to stop the massacres, Mike stays at the location to track the animatronics while Vanessa goes through town and takes them on one-by-one. Toy Chica and the Marionette, who is hiding inside of Chica's chest compartment, make their way towards the Schmidt home, where the Marionette possesses Abby. Realizing the danger at hand, Mike goes to the newer location and makes a desperate plea to the childrens' souls that haunt the location to help save Abby.

Mike and Vanessa make their way to the house, and Mike uses a music box given to him by Henry earlier to put the Marionette to sleep and free Abby from her control. After the Marionette's defeat, Michael and all of the Toy animatronics appear in their living room, where Michael reveals himself to be Vanessa's brother and William Afton's son, determined to carry on the latter's legacy. He orders the Toy animatronics to kill Mike, Abby, and Vanessa, but the newer location's animatronics all arrive at the scene and dismantle the Toys while Michael flees. The souls of the animatronics then start to fade away. Mike and Abby leave the house, and because Mike no longer trusts Vanessa for hiding the truth about Michael, he tells her to stay away. As Mike and Abby walk off, the Marionette reawakens and possesses Vanessa.

In a mid-credits scene, a group of delinquents raid the newer location in search of items that can be used for a planned haunted house attraction based on Freddy's. In their search, they discover William's corpse from the first film, still wearing his rabbit costume. As the group leave, his spirit takes control of the suit as it activates. In a post-credits voice-over by Henry, he leaves a recorded message for Mike, where he explains his relationship with Afton as former business partner and creators of the animatronics, and warns him about the Marionette before it abruptly ends.