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More than 900 Americans died in an isolated jungle in northern Guyana in November 1978; Jim Jones has gone down in history as a madman who drove his followers to suicide, but the truth is more complicated and tragic than that.

Very Scary People

Jim Jones: Unholy Massacre, Part 2

Jim Jones: Unholy Massacre, Part 1

The Zodiac Killer terrorizes Northern California in the late 1960s; he taunts the public with cryptic clues, threats of violence and ciphers that are supposed to lead to his identity, but mostly go nowhere.

Zodiac Killer: I Am the Zodiac, Part 2

Zodiac Killer: I Am the Zodiac, Part 1

A look at the deal makers and hangers-on who attached themselves to Aileen Wuornos, who is known as America's first female serial killer.

Aileen Wuornos: Monster Made, Part 2

Aileen Wuornos: Monster Made, Part 1

In Northern California, a masked predator meticulously plans his sexual assaults by studying the habits and routines of his female prey; after 27 years on the loose, police close in on the man they believe to be the NorCal Rapist.

NorCal Rapist: Phantom Predator, Part 2

NorCal Rapist: Phantom Predator, Part 1

Charles Manson is a violent predator who has powers of persuasion that make it possible for him to convince his hippie followers to brutally murder innocent strangers.

Charles Manson: The Devil's Work

In Chicago, community leader and part-time clown John Wayne Gacy leads a double life, transforming into a monster who preys on male teenagers and becomes the most prolific serial killer of his day.

John Wayne Gacy: Evil Secret

Host Donnie Wahlberg chronicles the twisted lives of diabolical criminals, such as Charles Manson, Aileen Wuornos, John Wayne Gacy, the Rev. Jim Jones, and others.

S1 E1 | John Wayne Gacy: Evil Secret

E14 | Jim Jones: Unholy Massacre, Part 2

E13 | Jim Jones: Unholy Massacre, Part 1

E12 | Zodiac Killer: I Am the Zodiac, Part 2

E11 | Zodiac Killer: I Am the Zodiac, Part 1

E10 | Aileen Wuornos: Monster Made, Part 2

E9 | Aileen Wuornos: Monster Made, Part 1

E8 | NorCal Rapist: Phantom Predator, Part 2

E7 | NorCal Rapist: Phantom Predator, Part 1

E4 | Charles Manson: The Devil's Work

E3 | Charles Manson: The Devil's Work

E2 | John Wayne Gacy: Evil Secret

E1 | John Wayne Gacy: Evil Secret