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Breakout Liminal Horror Hit Backrooms Is Officially Coming to HBO Max in September

A24's summer hit film, which grossed $396.5 million globally, begins streaming on HBO Max.

  • On Friday, September 25, the summer horror hit Backrooms will begin streaming on HBO Max after grossing $396.5M globally, becoming A24's highest-grossing film of all time.
  • Opening to $81.2M domestically in May, the film shattered A24's box office expectations, fueled by a built-in fanbase familiar with director Kane Parsons' viral YouTube series.
  • Starring Chiwetel Ejiofor, Renate Reinsve, and Mark Duplass, the film holds an 87% rating on Rotten Tomatoes; IGN critic Lex Briscuso called it "a truly terrifying cinematic rabbit hole."
  • The film will air on HBO linear channels on Saturday, September 26, at 8PM E.T., while 4K Blu-rays featuring "over three hours of special features" are available from the A24 Shop.
  • Director Parsons has expressed interest in adapting the 2007 Valve game Portal, while sequel talks continue exploring actor Mark Duplass' character and the mysterious research institute.
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Variety broke the news in Los Angeles, United States on Tuesday, August 25, 2026.
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