Olivia Cooke as Laine Morris

Ana Coto as Sarah Morris

Matthew Settle as Anthony Morris

Shelley Hennig as Debbie Galardi

Daren Kagasoff as Trevor

Bianca A. Santos as Isabelle

Douglas Smith as Pete

Robyn Lively as Mrs. Galardi

Sierra Huermann as Doris Zander

Lin Shaye as Paulina Zander

Claudia Katz Minnick as Alice Zander

Afra Sophia Tully as Young Laine

Izzie Galanti as Young Sarah

Sunny May Allison as Young Doris

Claire Beale as Young Debbie

Vivis Colombetti as Nona

Bill Watterson as Hank

Morgan Peter Brown as Grief Counselor

Jake Lucas as Institution Guard (as Jacob Lucas)

Ken Blackwell as Internet Expert

Kathleen Coyne as Mourner #1

Leigh Bush as Mourner #2

Emily Brobst as Demon (uncredited)