Flashback
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
Fred Fitzell
Hannah Gross
Karen
Emory Cohen
Sebastian
Keir Gilchrist
Andre
Maika Monroe
Cindy Williams
Liisa Repo-Martell
Mrs. Fitzell
Amanda Brugel
Evelyn
A.C. Peterson
Mr. MacDonald
Aaron Poole
Pierced Man
Maika Harper
Tattooed Woman
Ian Matthews
Vincent
Donald Burda
Dr. Phillips
Myles Isen
Fred at 6
Connor Smith
Scarred Man
Leslie Adlam
Female Cop
Andrew Latter
12 Year Old Boy
Jill Frappier
Mrs. Shouldice
Josh Cruddas
Twenty Something Man
Conrad Bergschneider
Male Teacher
Tracy Baker
Dancer
Jackie English
Violet
Constantine Meglis
Huge Bouncer
Elizabeth Osler
Overdosed Teen
Prince Amponsah
Mysterious Party Goer
Parker Antal
Baby Fred
Emmet Antal
Baby Fred
Landon Norris
Scarred Man (voice)
Hershel Blatt
Mike (uncredited)
Sima Fisher
Dancer (uncredited)