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A romantic encounter William Shatner allegedly had in 1956 could cost him big in 2016.

Peter Sloan claims the "Star Trek" actor is his father and has filed a $170 million lawsuit accusing Shatner of libel, defamation and slander. He's also demanding Shatner consent to a paternity test and is asking for a jury trial, according to the New York Post.

Sloan, a 59-year-old radio show host in Florida, alleges the actor got his mother, actress Kathy McNeil, pregnant during a tryst in Toronto. He says McNeil put him up for adoption days after his birth and never told Shatner they'd conceived a child.

Sloan's claim isn't news to Shatner.

In the lawsuit, Sloan claims he met his would-be dad on the set of "T.J. Hooker" in 1984, at which time Shatner purportedly "admitted he was the plaintiff's father" before doing an about-face on the admission a week later when he says Shatner's rep contacted him to let him know the actor had "totally" denied "paternity."

"Don't go public," the rep allegedly told Sloan, "... [as it] could be horrendous for [Shatner]."

The lawsuit also claims the actor, now 85, refused to take a paternity test.

The plot thickens from there.

The Post reports Sloan subsequently showed up at a meet-and-greet to see Shatner and registered petershatner.com -- a nod to the name he was using for his 2011 CBS radio show. It wasn't long before Sloan was contacted by another rep for the actor.

"Bill ... confirmed to me once again that he is not your father," Shatner's lawyer, Eric Hyman, reportedly wrote to Sloan in a letter. "There have been many people over the years who have claimed to be his children or other relatives. He is an incredibly busy, 80-year-old man, and is not interested in spending time discussing this issue with you."

Sloan -- whose website promotes a book he wrote called "The Search," a narrative about Sloan's supposed discovery that Shatner is his biological father -- claims Shatner's people had his Twitter account closed and got imdb Pro to axe a page about the film he was working on.

"I am William Shatner's son, and I just wish he would acknowledge me," Sloan tells the Post.

A rep for Shatner told the tab the actor "has three lovely daughters but no sons … Mr. Shatner is aware of the lawsuit, but there's nothing there because he isn't his father."

Last May, Shatner's publicist Cherry Hepburn gave the Tampa Tribune a virtually verbatim statement about her client's daughters -- and his lack of male children.

"This person has fraudulently portrayed himself as Mr. Shatner's son for years," she added.