Culled from more than 100 hours of new and archival interviews with former Manson cult members, this two-hour special goes inside Spahn’s Ranch, where the Manson cult lived, to offer an intimate and terrifying look into America’s most murderous group.
| Actor | Role |
|---|---|
 Liev SchreiberNarrator | Narrator |
| RRyan O'ConnellCharles Manson | Charles Manson |
| KKk StarrsSharon Tate | Sharon Tate |
 Shana EvaRonnie Howard | Ronnie Howard |
| MMelissa FarleySusan (Sadie) Atkins | Susan (Sadie) Atkins |
| BBella TindallDianne Lake | Dianne Lake |
| CCalysta StricklerNancy Pitman | Nancy Pitman |
 Jason McCriteGary Hinman | Gary Hinman |
| HHayla StewartMary Brunner | Mary Brunner |
| KKeith J. ObitManson Family Member | Manson Family Member |
| MMathew David TorresPoliceman #1 | Policeman #1 |
| BBrian SlaytonPoliceman #2 | Policeman #2 |
 Charles MansonSelf (archive footage) | Self (archive footage) |