based on novel or book (2021)

Sadie Sink Christine 'Ziggy' Berman Emily Rudd Cindy Berman Ryan Simpkins Alice McCabe Slye Tommy Slater Ted Sutherland Young Nick Goode Chiara Aurelia Sheila Brandon Spink Young Will Goode Marcelle LeBlanc Becky Eden Campbell Annie Michael Provost Kurt Drew Scheid Gary Jacqi Vene Joan Sam Brooks Arnie Kiana Madeira Deena Johnson Benjamin Flores Jr. Josh Johnson Olivia Scott Welch Samantha 'Sam' Fraser Gillian Jacobs C. Berman / Adult Ziggy Ashley Zukerman Sheriff Nick Goode Jordana Spiro Nurse Mary Lane Jordyn DiNatale Ruby Lane Kevin Waterman 'The Milkman' Harry Rooker Emily Brobst Billy Barker Keil Oakley Zepernick 'Shame Killer' Isaac Milton Michael Chandler 'The Pastor' Cyrus Miller Elizabeth Scopel Sarah Fier Matthew Zuk Mayor Will Goode Jason Edwards Sunnyvale Cop Paul Teal Young Officer Kapinski Dylan Gage Jeremy Kenneth Trujillo EMT Julia Rehwald Kate Schmidt (archive footage) Fred Hechinger Simon Kalivoda (archive footage) Alex Huff Mean Sunnyvale Jailer