Linda Cardellini Joins Cast of Bill Hader's Horror Film 'They Know'

The film centers on a divorced dad who grows suspicious of his ex-wife's new mysterious boyfriend.

Apr. 13, 2026 at 5:18pm

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An extreme close-up photograph of shattered glass reflecting a faint red light, creating an abstract, high-contrast texture that evokes a sense of unease and foreboding.The unsettling visual texture of shattered glass hints at the dark, mysterious tone of Bill Hader's new horror film 'They Know'.Los Angeles Today

Linda Cardellini, known for her roles in films like 'The Curse of La Llorona', has joined the cast of the upcoming horror movie 'They Know', directed by Bill Hader. The film follows a divorced father who becomes suspicious that his ex-wife is secretly dating a mysterious man who is having a strange influence on their children.

Why it matters

Hader's involvement as both director and co-writer of the original story for 'They Know' is notable, as he has cemented himself as a horror fan favorite with his performance as Richie Tozier in 'IT: Chapter Two'. Cardellini's casting adds further intrigue, as she is also set to play Pamela Voorhees in the upcoming 'Friday the 13th' prequel series on Peacock.

The details

The film is being financed by MRC, with Hader and Bob Graf producing under Hader's Hanarply banner, and Alyssa Donovan co-producing. Production on 'They Know' began today in Los Angeles.

  • The film began production in Los Angeles earlier today (April 13, 2026).

The players

Linda Cardellini

An American actress known for her roles in films like 'The Curse of La Llorona' and the upcoming 'Friday the 13th' prequel series on Peacock.

Bill Hader

An American actor, comedian, writer, producer and director, who is directing and co-writing the original story for 'They Know'. He is known for his horror performance as Richie Tozier in 'IT: Chapter Two'.

MRC

An American media company that is financing the production of 'They Know'.

Hanarply

Bill Hader's production company, which is producing 'They Know'.

Alyssa Donovan

The co-producer on 'They Know'.

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The takeaway

The involvement of horror fan favorite Bill Hader, both as director and co-writer, combined with the casting of Linda Cardellini, who is also set to play an iconic horror character, suggests 'They Know' could be a highly anticipated new entry in the genre.