“Euphoria ” is back. After a four-year hiatus, creator Sam Levinson was excited to take the high-school characters into adulthood. He says, “They can be in the wider world, and with that freedom comes obvious consequences.” Enter Rue ( Zendaya ). For the last few years, she has spent her days up to no good as she smuggles fentanyl across the border. It’s all part of paying off her debt to her dealer, Laurie (Martha Kelly). The show opens with her driving her beat-up car on another run. She