Who plays Cassie in Euphoria? Sydney Sweeney
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HBO's 'Euphoria': Who is in the cast and who are they playing?
9. Who plays Cassie in Euphoria? Sydney Sweeney
Sydney plays Lexi's older sister with an infamous sexual past. Sydney was recently seen in the cancelled-too-soon Netflix coming-of-age series 'Everything Sucks'. You'll also know her as Eden in 'The Handmaid's Tale' and Alice in HBO's 'Sharp Objects'.