Fear Street: 1666

, also known as Fear Street Part 3: 1666 is an American horror film directed by Leigh Janiak from a screenplay by Kate Trefry. It is based on Fear Street trilogy of the same name by R.L. Stine. It is the final installment in the Fear Street Trilogy.

On August 11, 2020, Deadline reported that sources told them that Netflix just closed a deal with Disney to acquire a trilogy of interconnected Fear Street films adapted from R.L. Stine’s bestselling book series. Director Leigh Janiak has wrapped all three films, and the early plan is to run them a month apart next summer. This will be wrapped into a themed event that will be marketed by Netflix as The Summer of Fear.

The movie was released by Netflix on July 16, 2021. It is preceded by Fear Street: 1994, released on July 2 and Fear Street: 1978, released on July 9.

Summary
"Thrust back to 1666, Deena learns the truth about Sarah Fier. Back in 1994, the friends fight for their lives — and Shadyside’s future."

- Official Netflix synopsis

1666
After reuniting the severed hand of Sarah Fier with the rest of her corpse, Deena has a vision showing the events of 1666 from the perspective of Sarah Fier herself. She lives with her father George and brother Henry in Union, the original settlement before it was divided into Sunnyvale and Shadyside. The community also includes Pastor Cyrus Miller, his daughter Hannah, Abigail and her sister Constance, Mad Thomas, Caleb, Sarah's friends Lizzie and Isaac, Solomon Goode, and Solomon's brother Elijah.

One night, Sarah, Lizzie, and Hannah meet a reclusive widow to gather potent berries for a party, where Sarah stumbles on a book of black magic. After fleeing, the group arrive at the party where Sarah and Hannah are harassed by Caleb as they reject his advances. The two run off and get intimate, unknowingly seen by Mad Thomas. The next day, Pastor Miller begins to act strange, as the town's food and water supply is destroyed. Sarah confides in Solomon and wonders if she is responsible for the town's bad luck. The two discover Pastor Miller has murdered a dozen children in the chapel, including Henry and Constance. Sarah is nearly murdered by Pastor Miller before he is killed by Solomon. That night, a town meeting is held at which the townspeople decide that witchcraft is the cause of the events, and Caleb claims that Sarah and Hannah are the witches responsible. The two attempt to flee, but Hannah is captured while Sarah escapes, as the town declares that Hannah will be executed at dawn.

Sarah sneaks into the chapel where Hannah is confined and the two profess their love. Sarah decides to retrieve the widow's book and use it to make a deal with the devil and save Hannah, but she finds the book gone and the widow murdered. She flees to Solomon's house for help and hides in the back room after he is ambushed by men hunting Sarah. While hiding, she finds tunnels under his house, discovering a ritual as well as the widow's book. Solomon reveals he took the book to make a deal with the devil, offering Pastor Miller to be possessed to kill others in exchange for power and wealth. He offers to share it with her, but Sarah rejects his offer and flees into the tunnels. He catches her and the two fight, with her hand cut off in the ensuing struggle. She escapes to the chapel, but is found by the townspeople and arrested. At Sarah and Hannah's execution, Sarah convinces the town to spare Hannah's life and swears vengeance to Solomon before she is hanged. Later, Lizzie, Issac, Hannah, and Abigail grieve Sarah and properly bury her body.

1994
As Deena's vision ends, she realizes that the Goode family is responsible for the Shadyside curse, as the firstborn of each generation repeat the ritual begun by their ancestor Solomon. She and Josh are found by Sheriff Nick Goode, but the two manage to escape in Nick's car and arrive at Ziggy's house, where Ziggy is still watching a possessed Sam. The trio deduce they must kill Nick in order to stop the Shadyside curse. After they recruit the help of Martin, a mall janitor, the group concoct a plan to lure Nick to the mall and set traps to have the Shadyside murderers kill him.

The group manage to temporarily trap the killers and Ziggy lures Nick to the center of the mall, where she pours a bucket of Deena's blood over him, causing the killers to attack him. However, Nick manages to escape into the tunnels. Deena and a possessed Sam follow him while the others fight off the killers. Sam attacks Deena, but she is able to break Sam out of her possession temporarily before incapacitating her. Nick pins Deena down and nearly kills her, but Deena is able to expose Nick to a pile of beating organs, which gives him a vision of all of his killers' victims. Deena kills him, causing the killers to disappear and the curse to be broken. Later, the Goode family is exposed for their actions, Martin finds a career selling technology, Ziggy reunites with Mrs. Lane, and Deena and Sam have a picnic date at Sarah Fier's grave.

In a mid-credits scene, someone's hands are seen taking the widow's satanic book.

Cast and Characters

 * Kiana Madeira as Sarah Fier/Deena
 * Ashley Zukerman as Solomon Goode/Nick Goode
 * Gillian Jacobs as Adult Ziggy/C. Berman
 * Olivia Welch as Hannah Miller/Samantha Fraser
 * Benjamin Flores Jr. as Henry/Josh
 * Darrell Britt-Gibson as Martin
 * Fred Hechinger as Isaac/Simon
 * Julia Rehwald as Lizzie/Kate
 * Sadie Sink as Constance/Christine Berman
 * Emily Rudd as Abigail/Cindy Berman
 * McCabe Slye as Mad Thomas/Tommy Slater
 * Jordana Spiro as The Widow/Mrs. Lane
 * Jordyn DiNatale as Ruby Lane