My Best Friend's Exorcism is a 2022 American supernatural comedy horror film[1][2] directed by Damon Thomas from a screenplay by Jenna Lamia, based on the 2016 novel of the same name by Grady Hendrix.

The film stars Elsie Fisher, Amiah Miller, Rachel Ogechi Kanu, and Cathy Ang.

One night, they all ingest LSD provided by Margaret's boyfriend Wallace Stoney and, with the exception of Abby, go skinny-dipping in the lake.

Abby and Gretchen venture into an abandoned shack across the lake where a ritualistic Satanic murder allegedly occurred.

Over the next few days, Gretchen continues to behave erratically, projectile vomiting during lunch and urinating in a trash can while in class.

As they drive, a distraught Gretchen reveals that ever since "he" (whose name she does not disclose) attacked her at the abandoned shack, "he" has been visiting and watching her every night.

After manipulating closeted Glee into coming out as lesbian, Gretchen feeds her a nut-filled brownie, deliberately causing a severe allergic reaction.

Determined to save her friend, Abby turns to Christian, who confirms Gretchen is possessed and reluctantly agrees to help perform an exorcism.

In November 2018, it was announced that Endeavor Content had acquired the film adaptation rights for Hendrix's book.

[4] In April 2021, Elsie Fisher, Amiah Miller, Rachel Ogechi Kanu, and Cathy Ang were cast of the film.