Dak Prescott claims a woman is threatening to go public with false sexual assault allegations against him if he doesn't pay her $100 million ... and now, he's suing to try to put a stop to it all.
The Dallas Cowboys superstar filed the lawsuit in Collin County, Texas on Monday ... alleging the woman, Victoria Shores, spelled out her extortion plot in a letter to him and his representatives back on Feb. 13.
Prescott claims Shores alleged in her letter that he assaulted her in Feb. 2017 -- just after his rookie season with the Cowboys had concluded. He said in the suit that if and only if he paid her $100 mil, she'd stay silent about it all.
The quarterback's attorneys, however, said emphatically in the lawsuit Monday, "Mr. Prescott has never engaged in any nonconsensual sexual behavior with anyone."
In fact, they wrote, "the timeline of events and [Shores'] actions in the years since the alleged assault are consistent with being involved with only consensual actions with Mr. Prescott."
"The fact that Mr. Prescott did not hear a single negative thing about this supposed interaction from nearly a decade ago is truly telling of" Shores' motives.
Prescott is now suing the woman and her lawyers for defamation, slander, civil extortion/duress and more.
Prescott's attorney, Levi McCathern, wrote in a statement to TMZ Sports on Monday evening, "Lies hurt. Especially, malicious lies. We will not allow the Defendant and her legal team to profit from this attempt to extort millions from Mr. Prescott."
McCathern added that the 30-year-old signal-caller -- who just had his first child, a baby girl, last month -- has gone to authorities to report Shores' "criminal actions."