Hannah Murray as Leslie Van Houten

Sosie Bacon as Patricia Krenwinkel

Marianne Rendón as Susan Atkins

Merritt Wever as Karlene Faith

Matt Smith as Charles Manson

Suki Waterhouse as Mary Brunner

Chace Crawford as Tex Watson

Annabeth Gish as Virginia Carlson

Kayli Carter as Lynette 'Squeaky' Fromme

Cameron Gellman as Bobby Beausoleil

Matt Riedy as Police Chief Davis

Grace Van Dien as Sharon Tate

Lindsay Farris as Jay Sebring

Julia Schlaepfer as Sandra Good

James Trevena as Dennis Wilson

Bridger Zadina as Paul Watkins

India Ennenga as Linda Kasabian

Dan Olivo as Leno LaBianca

Jackie Joyner as Rosemary LaBianca

Morgan Melton as Ruth Ann Moorehouse

Bryan Adrian as Terry Melcher

Dayle McLeod as Catherine 'Gypsy' Share

Jeremy Lawson as Danny DeCarlo

Trevor Brunsink as Donald 'Shorty' Shea

Dillon Lane as Gregg Jakobson

Aria Taylor as Dianne Lake

John Frank Rosenblum as Officer Cole

Danya LaBelle as Barbara

Sol Rodríguez as Gloria

Kimmy Shields as Vicki

Aaron Leddick as Documentarian / Announcer

Blaine Gray as Golden Globes Guest

Kim Yarbrough as Tina

Tracy Perez as Carla

Anthony Traina as Phil

Darien Sills-Evans as Bill Morris

Christopher Gerse as Pete

Tony Armatrading as Guard Carl

Nathan Sutton as Steve Somewhere

Kimberly Gikas as Kay

Adria Baratta as Officer Hamilton

Marlon Braccia as Mrs. Van Houten