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Teenage Australian immigrant Stephanie Conway (Angourie Rice) has always struggled to fit in and makes a vow to be the most popular girl in high school. Her role model is ex-prom queen Deanna Russo who married the high school jock and lived her dream life at her dream house in the same suburb. Conway achieves her goals, becomes cheer captain, and clinches the hot guy as her boyfriend. However, the journey to her dreams is abruptly cut short after she falls in a coma following a cheerleading stunt gone wrong. She wakes up 20 years later and quickly realizes that life is no longer how she left it. Her best friends Martha (Mary Holland) and Seth (Sam Richardson) are now the high school principal and librarian, respectively. Her boyfriend Blaine (Justin Hartley) is married to her high school rival Tiffany (Zoë Chao). But perhaps the rudest awakening is finding out, after deciding to go back to finishing her senior year, how the dynamics of high school have changed after two decades.