If you've binged on Netflix's Mindhunter already, then you'll probably have spent at least one of your subsequent sleepless nights wondering about the people portrayed on-screen. (Have you locked your windows? Have you?)

The show is based on FBI agent John Douglas's memoir, and recounts his meetings with numerous real-life criminal psychopaths. The following are just a few of the people represented, from both sides of the law.

THE GOOD GUYS:

1. John Douglas

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Played by: Jonathan Groff

He's called Holden Ford in the show, to draw a line more clearly between the fictional and factual men. The real-life Douglas was also the inspiration for Thomas Harris's Jack Crawford character, as played by Dennis Farina, Scott Glenn, Harvey Keitel and Laurence Fishburne in the various adaptations of his Hannibal Lecter novels.

Douglas is one of the most prominent experts in the study of serial killers in the US, having founded the Criminal Profiling Program at the FBI's Behavioural Sciences Unit.

2. Robert K Ressler

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Played by: Holt McCallany

Bill Tench is an ex-Army FBI veteran, the experienced guiding hand to Holden Ford's wunderkind. In real life Robert K Ressler was a Military Police provost marshal who joined the FBI in 1970 and became prominent in the Behavioural Sciences Unit. He was only eight years senior to John Douglas, though, while actors McAllany and Groff have 22 years between them.

You can read all about him in his autobiography Whoever Fights Monsters.

3. Dr Ann Wolbert Burgess

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Played by: Anna Torv

In the show she's called Dr Wendy Carr, but the real Dr Burgess is literally a living legend in the world of nursing, a leading light in the assessment and treatment of victims of trauma and abuse. Among her many academic publications is Sexual Homicide: Patterns and Motives, which she co-authored with Ressler and Douglas.

THE BAD GUYS:

4. Ed Kemper

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Played by: Cameron Britton

The 6'9" Kemper was first incarcerated for the murder of his grandparents in his teens. Having convinced the authorities that he was fit to be released, he was allowed out after six years, and went on to murder and violate at least eight young women. He also killed his mother and one of her friends before handing himself in to the authorities.

As in the show, his high IQ and interest in policing led to him assisting Douglas and Ressler by offering insights into his own psychology.

5. Monte Rissell

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Played by: Sam Strike (Yes, him off EastEnders.)

Rissell raped and murdered five women in Virginia between 1976 and 1977, all before he even turned 19.

6. Dennis Rader

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Played by: Sonny Valicenti

Also known as the "BTK" killer, Rader commited a number of sexually-motivated murders over three decades, taunting the police with notes signed by "BTK", which stood for Bind, Torture, Kill. Like the unnamed Kansas man in the show, Rader worked for ADT Security Services, and later the federal census office.

He was president of his church council and a cub-scout leader.

7. Jerome Brudos

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Played by: Happy Anderson

Brudos was a shoe fetishist and necrophile who killed at least four women in Oregon in the late 1960s. Despite being a married father of two, he managed to conceal the fact that he was abducting and strangling young women for sexual gratification. Along with Ed Gein, he was one of the chief inspirations for Thomas Harris's character Buffalo Bill.

8. Richard Speck

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Played by: Jack Erdie

Unlike most of Douglas and Ressler's interview subjects, Speck was not a serial killer – though only, one suspects, because of a lack of opportunity. He was convicted of the torture, rape and murder of eight student nurses in a single night in 1966. A ninth woman only survived his spree by hiding in the room out of sight for the entire night.

From: Digital Spy