Frederick Fitzell is living his best life—until he starts having horrific visions of Cindy, a girl who vanished in high school. After reaching out to old friends with whom he used to take a mystery drug called Mercury, Fredrick realizes the only way to stop the visions lies deep within his own memories, so he embarks on a terrifying mental odyssey to learn the truth.
Dylan O'Brien
as Fred Fitzell
Hannah Gross
as Karen
Emory Cohen
as Sebastian
Keir Gilchrist
as Andre
Maika Monroe
as Cindy Williams
Liisa Repo-Martell
as Mrs. Fitzell
Amanda Brugel
as Evelyn
A.C. Peterson
as Mr. MacDonald
Aaron Poole
as Pierced Man
Maika Harper
as Tattooed Woman
Ian Matthews
as Vincent
Donald Burda
as Dr. Phillips
