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PEOPLE can exclusively premiere the trailer for Hal & Harper, <\/em>starring Lili Reinhart and creator and director Cooper Raiff<\/p>\n<\/div>\n<\/li>\n The eight-episode series sees Reinhart and Raiff as the eponymous siblings who grapple with their changing lives as their dad (Mark Ruffalo) gets ready to welcome a new baby with his girlfriend (Betty Gilpin)<\/p>\n<\/div>\n<\/li>\n Hal & Harper<\/em> premieres Oct. 19 on MUBI, followed by weekly releases through Nov. 30<\/p>\n<\/div>\n<\/li>\n<\/ul>\n Cooper Raiff<\/a> and Lili Reinhart<\/a> play codependent siblings grappling with all the scary changes of adulthood in Hal & Harper<\/em>.<\/p>\n PEOPLE can exclusively premiere the trailer for the series, which premiered at Sundance 2025, and stars Raiff, 28, and Reinhart, 29, as the eponymous siblings, with Mark Ruffalo<\/a> as their dad.<\/p>\n The trailer begins with a taste of just how tight siblings Hal (Raiff) and Harper (Reinhart) are, as Hal calls his sister in the middle of the night, asking her to get “dessert and fries with me” at 3 a.m.<\/p>\n “McDonald’s is so far away,” Harper laments, and Hal quips in response, “Yeah, you’re right, and traffic is pretty terrible right now.”<\/p>\n “Okay, idiot, where do I pick you up?” she asks, and Hal lifts up her bedroom window and somersaults into her room as he says, “You don’t. Because I’m already here.”<\/p>\n