- Ambyr Childers - Sadie
- Chance Kelly - Detective Ed Cutler
- Madisen Beaty - Patricia Krenwinkel
- Cameron Deane Stewart - Tex Watson
- Whitney Rose Pynn - Minnie
- Monique Barajas - Femme de ménage
- Beau Mirchoff - Rick Donovan
- Bryce Durfee - Jason Elkins
- Brian Poth - Chris
- Andy Umberger - Howard
- Yaani King Mondschein - wanda
- Yetide Badaki - Rita Carter
- David Proval - Danilo
- Jayme Lynn Evans - Tracy Kimball
- Jarrett Sleeper - Sabovich
- Christopher Poehls - Officer Robert Ettlin
- Marshall Allman - Robbie Arthur
- Jason Ralph - Mike Vickery
- Jason Ralph - Mike Vickery (uncredited)
- Candace Hammer - Sheryl
- Spencer Garrett - HALL BANNING
- Jonathan Stanley - Officer Clark
- Clare Carey - Lucille Gladner
- Judy Kain - Mitzi
- Andy Favreau - Dennis Wilson
- Peter MacKenzie - Sean Boyle
- Chase Coleman - Terry Melcher
- JD Cullum - H.R. Haldeman
- Scott Bailey - Bobby Kennedy
- Matthew Arkin - Detective Blumenthal
- Elizabeth Sampson - Mary Boyle
- Cynthia Sikes - Betty Goodale
- Joe Williamson - Bill Copley
- Chris Brew - Wesley
- Ryan Caldwell - Martin O'Reilly
- Zachary Mooren - Gregg Jakobson
- David Sampen - Musician
- Doug Simpson - Coroner Spring
- Nick Toren - Phil Gleason
- Inger Tudor - Winifred Chapman
- Bruce M. Stockert - Man at Diner (uncredited)
- Morgan McClellan - Ben Healy
David Proval hace el papel de Danilo.
David Duchovny hace el papel de Detective Sam Hodiak.
Grey Damon interpreta a Brian Shafe en la serie.
Gethin Anthony interpreta a Charles Manson en la serie.
Emma Dumont interpreta a Emma Karn en la serie.
Claire Holt hace el papel de Charmain Tully.
Michaela McManus interpreta a Grace Karn en la serie.
Brían F. O'Byrne interpreta a Ken Karn en la serie.
Milauna Jackson interpreta a Kristin Shafe en la serie.
Ambyr Childers interpreta a Sadie en la serie.
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