Robert GraysmithHimself - Author of 'Zodiac' and 'Zodiac Unmasked' | Himself - Author of 'Zodiac' and 'Zodiac Unmasked' |
| AArthur SpinelliHimself - Former Solano County Saloon Owner | Himself - Former Solano County Saloon Owner |
| DDonald CheneyHimself - Former Friend of Arthur Leigh Allen | Himself - Former Friend of Arthur Leigh Allen |
| SSandy PanzarellaHimself - Friend of Donald Cheney & Acquaintance of Arthur Leigh Allen | Himself - Friend of Donald Cheney & Acquaintance of Arthur Leigh Allen |
| NNorman BoudreauHimself - College Friend of Arthur Leigh Allen | Himself - College Friend of Arthur Leigh Allen |
| GGeorge BawartHimself - Vallejo Police Dept (Ret) | Himself - Vallejo Police Dept (Ret) |
| SSharon Pagaling HagonHerself - Criminal Profiler | Herself - Criminal Profiler |
| DDonald FoukeHimself - San Francisco Police Dept (Ret) | Himself - San Francisco Police Dept (Ret) |
| DDavid SlaightHimself - Napa County Sheriff Dept (Ret) | Himself - Napa County Sheriff Dept (Ret) |
| NNancy SloverHerself - City of Vallejo '355' Operator | Herself - City of Vallejo '355' Operator |
| KKim RossmoHimself - Research Professor, Department of Criminal Justice, Texas State University | Himself - Research Professor, Department of Criminal Justice, Texas State University |