Maika Monroe plays Jay Height, the main protagonist who is followed by a supernatural entity after a strange sexual encounter.
Keir Gilchrist portrays Paul, Jay's friend who supports her as she deals with the sinister entity.
Daniel Zovatto takes on the role of Greg Hannigan, a friend of Jay's who becomes entangled in the mysterious events.
Jake Weary plays Hugh, a character who passes on the curse of the entity to Jay, setting the events of the movie in motion.
Olivia Luccardi portrays Yara, Jay's friend who provides emotional support during her struggles.
Lili Sepe plays Kelly Height, Jay's sister who also gets involved in the terrifying ordeal.
Bailey Spry takes on the role of Annie, a character connected to the main group of friends.
Carollette Phillips plays the Woman with Groceries, a minor character who encounters Jay during a crucial moment.
Loren Bass portrays Annie's Father, a character briefly seen in the movie.
Charles Gertner plays Neighbor Boy, a minor character who resides in the neighborhood where Jay and her friends live.
Debbie Williams portrays Mrs. Height, Jay and Kelly's mother in the film.
Ruby Harris plays Mrs. Redmond, a minor character who appears briefly in the movie.
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