- Paxton Singleton - Young Steven
- Mckenna Grace - Young Theodora
- Julian Hilliard - Young Luke
- Violet McGraw - Young Nell
- Saidah Arrika Ekulona - Mrs. Walker
- Kurt Yue - Attorney
- Trace Masters - Max
- David Shae - Max's Father
- Arianne Martin - Max's Mother
- Tenaya Cleveland - Rehab Coordinator
- Christine Horn - Eileen
- Craig Welzbacher - Rick
- Selena Anduze - Paige
- Nelson Bonilla - Gordon
- Tiffany Denise Hobbs - NA Chip Person
- Wes Jetton - Addict 1
- Dominick Racano - Addict 2
- Amber Chaney - Addict 3
- Jordane Christie - Arthur
- Katie Carpenter - Stacey
- J.P. Valenti - Fan #1
- Keith Arthur Bolden - Sheriff Beckley
- Logan Medina - Jayden Harris
- Carrie Walrond Hood - Fertility Doctor
- Polly Craig - Older Poppy
- Mimi Gould - Older Hazel
- James Lafferty - Ryan
- Katie Parker - Poppy
- Fedor Steer - William
- Justin James Boykin - Bartender
- Levy Tran - Trish Park
- Jamie Flanagan - Funeral Director
- Anna Enger Ritch - Joey
- Annabeth Gish - Mrs. Dudley
- Shirley Jackson
- Charise Castro Smith
- Ann Kindberg
- Mike Flanagan
- Trevor Macy
- Scott Kosar
- Darryl Frank
- Jonathan Wales
- Taylor Stewart
- Trevor Gates
- Paul B. Knox
- Andrew Grush
- Matthew Nicolay
Michiel Huisman interpreta a Steven Crain en la serie.
Elizabeth Reaser hace el papel de Shirley Crain.
Kate Siegel interpreta a Theodora Crain en la serie.
Oliver Jackson-Cohen hace el papel de Luke Crain.
Victoria Pedretti interpreta a Nell Crain en la serie.
Timothy Hutton hace el papel de Hugh Crain.
Carla Gugino hace el papel de Olivia Crain.
Henry Thomas interpreta a Young Hugh Crain en la serie.
Lulu Wilson interpreta a Young Shirley en la serie.
Paxton Singleton interpreta a Young Steven en la serie.
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