SERIAL rapists and murderers Paul Bernardo and Karla Homolka terrorized Canada in the early 1990s, filming sickening footage of themselves torturing and killing young women.

The "Ken and Barbie Killers" got their start by drugging and assaulting Homolka's teenage sister not once, but twice–and on their second attempt, the drug dosage proved fatal.

The couple were found guilty in the deaths of three minor girls in the Ontario area, but Bernardo is tied to at least 14 other rapes and six attempts.

A new four-part docuseries, Ken and Barbie Killers: The Lost Murder Tapes, premiered on Discovery+ at 9pm ET on Sunday night.

Upcoming episodes of the show will also be available to watch on Investigation Discovery, a television channel.

Tammy Homolka

In July of 1990, the couple drugged Karla Homolka's younger sister Tammy, who was only fifteen years old.

The teenager passed out, and Bernardo sexually assaulted her for a few minutes before she regained consciousness.

Tammy reportedly didn't remember anything about the assault.

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Later that year, just before Christmas, Homolka brought an anesthetic home from the veterinary clinic where she worked, and the couple once again drugged Tammy.

Both Bernardo and Homolka reportedly participated in raping Tammy.

Then, in what the couple insisted was an accident, unconscious Tammy began to choke on her own vomit.

The girl died only weeks before her 16th birthday.

The couple dressed Tammy, cleaned her up, and placed her in the bedroom before calling 911.

The death was ruled an accident and the couple were not arrested or charged.

Leslie Mahaffy

Almost one year after they first drugged and assaulted Tammy, Bernardo and Homolka kidnapped and killed 14-year-old Leslie Mahaffy.

In the early morning hours of June 15, 1991, Bernardo discovered Leslie outside her home, where she had been locked out.

He brought Leslie back to Homolka, and together, they raped and tortured her for hours.

In video footage, the couple captured the torture, their taunts, and Leslie's struggle.

They reportedly kept Leslie restrained in their home overnight, then killed her the next day.

Bernardo claims that Homolka killed Leslie with a lethal anesthetic overdose; Homolka said that Bernardo strangled Leslie to death.

The couple left Leslie's body in the basement while they hosted a family dinner.

Then, they dismembered Leslie with a circular saw, encasing each of the separated body parts in cement and dumping them in Lake Gibson.

Weeks later, one cement brick full of remains was discovered by a father and son on a fishing trip.

Leslie's remains were reported to authorities on Homolka and Bernardo's wedding day.

Kristen French

Kristen French was a student at Holy Cross Secondary School in St. Catharines, Ontario.

Walking home from school one day, she was accosted by Homolka, who pretended to be asking for directions.

While Homolka distracted Kristen, Bernardo surprised her, forcing the teenager into their car at knifepoint.

Kristen was abducted on Thursday afternoon, and tortured her over Easter weekend.

They once again filmed themselves torturing and raping Kristen, forcing her to drink alcohol and wear a schoolgirl oufit.

Bernardo and Homolka killed Kristen on Sunday, before leaving for Easter dinner.

The pair once again delivered conflicting reports of who killed Kristen.

Bernardo said that Homolka beat her severely with a rubber mallet, then strangled her with a noose.

Homolka testified that Bernardo strangled Kristen to death with an electrical cord.

The pair dumped Kristen's body in a ditch 45 minutes outside her neighborhood, and she was discovered on April 30, two weeks after her abduction.

DNA evidence discovered on Kristen's body linked her to several other rapes committed by Bernardo.

Dubbed The Scarborough Rapist, Bernardo also admitted to at least 10 other sexual assaults and has been tied to six attempted rapes.

Homolka eventually told the police Bernardo had coerced her to provide him with victims, but the video footage the couple had taken proved her to be guilty as well.

With six tapes of evidence, police were able to sentence the two to prison.

Bernardo was convicted in 1995 of first-degree murder, kidnapping, and aggravated sexual assault. He is serving a life sentence in Ontario.

Homolka was convicted of manslaughter, and served 12 years in prison.

After her release in 2005, she married Thierry Bordelais, her attorney's brother.

Bordelais and Homolka, who has since changed her name, reportedly have multiple children together.

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