Main cast:

Darby Stanchfield as Nina Locke, the matriarch of the Locke family

Connor Jessup as Tyler Locke, the eldest son of the Locke family

Emilia Jones as Kinsey Locke, the middle child and only daughter of the Locke family

Jackson Robert Scott as Bode Locke, the youngest son of the Locke family

Petrice Jones as Scot Cavendish, a British student filmmaker at Matheson Academy, and a love interest of Kinsey

Laysla De Oliveira as Dodge, the "well lady" of Keyhouse, who was the demon who possessed Lucas

Griffin Gluck as Gabe, a new student at Matheson Academy, and a love interest of

Recurring cast:

Bill Heck as Rendell Locke, the patriarch of the Locke family and Nina's deceased husband

Aaron Ashmore as Duncan Locke, Rendell's younger brother

Sherri Saum as Ellie Whedon, an old friend of Rendell who dated Rendell's best friend Lucas back in high school and a physical education teacher at Matheson Academy

Thomas Mitchell Barnet as Sam Lesser, Rendell's student who shoots and kills Rendell
Kevin Alves as Javi, Tyler's friend who is on the hockey team with him at Matheson Academy

Genevieve Kang as Jackie Veda, a girl that Tyler has a crush on

Hallea Jones as Eden Hawkins, Jackie's best friend

Kolton Stewart as Brinker Martin, Javi's friend

Asha Bromfield as Zadie Wells, one of Scot's friends

Jesse Camacho as Doug Brazelle, one of Scot's friends

Eric Graise as Logan Calloway, a disabled student at Matheson Academy

Felix Mallard as Lucas Caravaggio,[c] Rendell's best friend from high school

Steven Williams as Joe Ridgeway, the dean of 11th grade and Tyler's English teacher at Matheson Academy

Coby Bird as Rufus Whedon, Ellie's adopted son and the groundskeeper of Keyhouse