Starring Agron as Ella, the film sees her undergo a clinical trial in order to restart her apparently broken biological clock, following pressure from those around her to have children.
Initial responses have been positive for the film, which is currently sitting at 100% on Rotten Tomatoes at the time of writing.
Reviews have praised the movie's approach to motherhood and maternal pressure, as well as the performances of Agron and Hardin.
"Despite some third-act stumbles, Clock is a shocking experience supported by stunning performances from Dianna Agron and Melora Hardin," states Dread Central.
"At its best when it is engaging in actual commentary on motherhood and less when it tries to make you jump, Clock thoughtfully adds to the maternal horror subgenre," added But Why Tho.
"Dianna Agron is stunning as Ella. As Ella’s confidence and love of her kid-free life begins to wane, and a vulnerable mess of a woman emerges, audiences get to see Agron’s range as an actress."
Meanwhile, ScullyVision called the film a "thematically rich take on body horror", writing: "This strong character work is bolstered by moments of more classic terror — Clock features a wealth of shocking imagery and a handful of cleverly staged scares.
"This gives the film a palpable sense of dread and suspense, while also providing food for thought."
Clock will be released on Hulu in the US and Disney+ in the UK on April 28.
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