Linda Cardellini Joins Bill Hader's Thriller 'They Know' - Cast News & Updates (2026)

Get ready for a thrilling new project that’s already sparking buzz in Hollywood! Linda Cardellini is in negotiations to join Bill Hader in the upcoming feature film They Know, a gripping story that blends suspense with a touch of paranoia. But here’s where it gets intriguing: Hader isn’t just starring in the film—he’s also writing, directing, and producing it, marking a bold step in his multifaceted career. They Know centers on a recently separated man who becomes increasingly convinced that his wife and children are under the influence of their mysterious new neighbor. If the deal goes through, Cardellini will step into the role of the wife, while Hader himself will portray the husband, Kyle. And this is the part most people miss: the film is being produced by MRC, the powerhouse studio behind critically acclaimed projects like Emerald Fennell’s Wuthering Heights and the Netflix hit Ozark. Casting for the remaining roles is currently underway, and production is set to kick off in April.

Bill Hader, best known for his Emmy-winning performance as the titular character in HBO’s Barry, has been making waves in both live-action and animation. He recently lent his voice to John Krasinski’s IF and is set to star as the titular character in Warner Bros.’ animated adaptation of The Cat in the Hat. But here’s a thought-provoking question: As Hader takes on more behind-the-camera roles, is he redefining what it means to be a modern Hollywood star?

Linda Cardellini, on the other hand, is no stranger to diverse roles, from her memorable turns in the live-action Scooby-Doo films to her acclaimed performance in Netflix’s dark comedy Dead to Me. She’s also left her mark on the Marvel Cinematic Universe as Laura Barton. With upcoming projects like DTF St. Louis, Crystal Lake, and Way of the Warrior Kid, Cardellini continues to showcase her versatility.

But here’s the controversial part: Will They Know lean into psychological thriller territory or veer into something more supernatural? The premise leaves room for interpretation, and that’s exactly what makes it so compelling. What do you think? Is this the kind of project that could redefine both Hader’s and Cardellini’s careers? Let us know in the comments—we’re eager to hear your take!

Linda Cardellini Joins Bill Hader's Thriller 'They Know' - Cast News & Updates (2026)

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