Linda Cardellini Joins Bill Hader Horror Movie 'They Know'

The Emmy-nominated actress will play the ex-wife of Hader's character in the new MRC horror film.

Apr. 13, 2026 at 5:00pm

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An extreme close-up photograph of shattered glass and glittering shards in a high-contrast, high-fashion studio lighting setup, conceptually representing the dark, unsettling mystery at the heart of the new horror film.The casting of acclaimed actress Linda Cardellini opposite Bill Hader in the new MRC horror film 'They Know' adds a layer of high-stakes drama to the project's unsettling premise.Los Angeles Today

Linda Cardellini has closed a deal to join Bill Hader in the horror film 'They Know' for MRC. The movie, which kicks off production in Los Angeles today, centers on a divorced dad (Hader) who grows suspicious that his ex-wife (Cardellini) is secretly dating a mysterious man who is having a strange influence on their children.

Why it matters

Cardellini is a highly acclaimed actress known for her work in projects like 'Dead to Me,' 'Green Book,' and 'Bloodline.' Her casting in the lead role opposite Hader adds significant star power and dramatic weight to the new horror film from MRC.

The details

Based on a script from Hader, stemming from an original story he created with his 'Barry' collaborator Duffy Boudreau, 'They Know' is being produced by Bob Graf and Hader under the latter's Hanarply banner, with Alyssa Donovan co-producing. Cardellini is repped by CAA and Jackoway Austen Tyerman.

  • Production on 'They Know' began today in Los Angeles.

The players

Linda Cardellini

An Emmy, SAG Award, and Spirit Award-nominated actress known for her work in projects like 'Dead to Me,' 'No Good Deed,' 'Green Book,' and 'Bloodline.'

Bill Hader

The actor and comedian who is starring in and producing the new horror film 'They Know' for MRC.

MRC

The studio financing and producing the new horror film 'They Know.'

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The takeaway

The casting of acclaimed actress Linda Cardellini opposite Bill Hader in the new MRC horror film 'They Know' adds significant star power and dramatic weight to the project, which is expected to generate strong interest from genre fans.