Season 3 of Euphoria is expanding by bringing back Zendaya, Sydney Sweeney, Jacob Elordi and more OG stars - while also bringing in newcomers including Priscilla Delgado, Darrell Britt-Gibson and Toby Wallace. Euphoria, which premiered in 2019, originally followed troubled high school student Rue (Zendaya) as she struggled to remain sober after rehab. The hit HBO series was quickly renewed for a second season after its premiere, but it took nearly three years for the next batch of episodes to air.