LOS ANGELES (AP) — “It Ends With Us” actor and director Justin Baldoni has sued his co-star Blake Lively and her husband, “Deadpool” actor Ryan Reynolds, for defamation and extortion on Thursday in the latest move in a bitter legal battle surrounding the dark romantic drama.

The lawsuits surrounding It Ends With Us keep making headlines.

Another chapter has unfolded in the relentless legal saga between "It Ends With Us" co-stars Blake Lively and Justin Baldoni. Escalating his litigiousness, Baldoni has sued Lively and her husband Ryan Reynolds for $400 million,

Baldoni, in a lawsuit filed in New York federal court on Thursday, alleges extortion, defamation and claims related to breach of contract, among several others. He’s joined by his film studio, Wayfarer, and its chief executive Jamey Heath, and their public relations representatives, Melissa Nathan and Jennifer Abel. They seek at least $400 million.

The "Deadpool" franchise is named in Justin Baldoni's new lawsuit against "It Ends With Us" costar Blake Lively and her husband Ryan Reynolds. Here's why.

Baldoni and Lively have been at odds since the now-endless It Ends With Us press tour, after which rumors of sexual harassment allegations spilled into the press. By the end of Us, Baldoni had filed suit against the Times for its bombshell story accusing him of harassing Lively and orchestrating a smear campaign against him.

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Ryan Reynolds is one of the stars to have invested in Colombian soccer team La Equidad—a deal that was announced the same day as Justin Baldoni’s lawsuit against the Deadpool star and Blake Lively.

"It is not strange that Ryan Reynolds was named in light of Baldoni's theories in the complaint," a defamation attorney tells Yahoo Entertainment.