A third woman accusing Supreme Court nominee Brett Kavanaugh of sexual misconduct has come forward — alleging he helped “drug” girls at parties in the 1980s where they were gang-raped.

In a response released by the White House, Kavanaugh said: “This is ridiculous and from the Twilight Zone. I don’t know who this is, and this never happened.”

In a signed declaration released Wednesday, a woman named Julie Swetnick said she knew Kavanaugh and his friend Mark Judge during high school in 1981 and 1982 and alleges she saw them and their pals spike punch at parties to make girls “lose their inhibitions.”

She said the young men would also get girls “inebriated and disoriented” so they could be “gang raped” by a “train” of boys.

“During the years 1981-82, I became aware of efforts by Mark Judge, Brett Kavanaugh and others to ‘spike’ the ‘punch’ at house parties I attended with drugs and/or grain alcohol so as to cause girls to lose their inhibitions and their ability to say ‘no,’” she said.

“I also witnessed efforts by Mark Judge, Brett Kavanaugh and others to cause girls to become inebriated and disoriented so they could then be ‘gang raped’ in a side bedroom by a ‘train’ of numerous boys.

“I have a firm recollection of seeing boys lined up outside rooms at many of these parties waiting for their ‘turn’ with a girl inside the room. These boys included Mark Judge and Brett Kavanaugh,” Swetnick said.

She said she was the victim of one of these “train” rapes, where Judge and Kavanaugh “were present” — and that other witnesses can verify what happened.

“During the incident, I was incapacitated without my consent and unable to fight off the boys raping me. I believe I was drugged using Quaaludes or something similar placed in what I was drinking,” Swetnick said.

“I am aware of other witnesses that can attest to the truthfulness of each of the statements above.”

Swetnick is being represented by lawyer Michael Avenatti, who is also the attorney for porn star Stormy Daniels and had previously announced that he has a client “with credible information regarding Judge Kavanaugh.”

Swetnick said she attended “well over ten house parties in the Washington DC area” where Kavanaugh and his Georgetown Prep classmate Judge were present. She alleges Kavanaugh was often verbally abusive to women and grabbed and fondled them without their consent.

“I observed Brett Kavanaugh drink excessively at many of these parties and engage in abusive and physically aggressive behavior toward girls, including pressing girls against him without their consent, ‘grinding’ against girls, and attempting to remove or shift girls’ clothing to expose private body parts,” her declaration reads.

Kavanaugh was last week accused of sexually assaulting Christine Blasey Ford at a party in the early 1980s, where Ford claims the then-17-year-old held her down and tried to pull her clothes off while covering her mouth. She claims Judge was also in the room.

Over the weekend, a second woman, Deborah Ramirez, came forward with allegations that Kavanaugh shoved his penis in front of her face at a drunken dorm room party while they were both at Yale during the 1983-84 academic school year.

Kavanaugh has denied the allegations, while Judge says he has “no memory” of the incident Ford describes.

Kavanaugh appeared on Fox News on Monday, where he said he was focused on athletics, studying and going to church during his high school years. He said he was a virgin while at school and “for many years after,” and always treated women “with dignity and respect.”

In her statement, Swetnick alleges that his claims of “lack of sexual activity … is absolutely false and a lie.”

Several of Kavanaugh’s former Yale classmates also pushed back against his claims that he never drank to the point of blacking out in his youth.

“Brett was a sloppy drunk, and I know because I drank with him. I watched him drink more than a lot of people. He’d end up slurring his words, stumbling,” Liz Swisher, a former college friend who was also Ramirez’s roommate, told The Washington Post.

Another woman recalled him wearing a superhero cape and leather football helmet one night while struggling to keep his balance and singing: : “I’m a geek, I’m a geek, I’m a power tool. When I sing this song, I look like a fool.”

But other pals said he never blacked out.

“I went out with him all the time. He never blacked out. Never even close to blacked out,” Chris Dudley, a former NBA player and the 2010 Republican candidate for governor of Oregon, told the Washington Post.

“There was drinking, and there was alcohol. Brett drank, and I drank. Did he get inebriated sometimes? Yes. Did I? Yes. Just like every other college kid in America.”