Part of Stranger Things featuring Millie Bobby Brown, Finn Wolfhard, Winona Ryder, David Harbour, and Gaten Matarazzo.
Rise to Fame
She walked into the Stranger Things audition at 14 and they told her she was too old for the part. She begged for more material anyway, lied about having rollerblading experience, and got the role. Max Mayfield became one of the show's most emotionally complex characters, especially by season 4, when the Running Up That Hill arc turned Sink into the breakout everyone was suddenly talking about. Before that, she'd already done Broadway (she played Annie in the 2012 revival), appeared in The Americans, and portrayed young Queen Elizabeth II on stage. The franchise just gave her the audience.
In the Spotlight
She's clearly not interested in being the Stranger Things girl indefinitely. The Whale in 2022 put her opposite Brendan Fraser in a Darren Aronofsky film and earned her a Critics' Choice nomination. O'Dessa flopped, but critics singled her performance out as the one thing that worked. In May 2025, she earned a Tony Award nomination for Best Actress in a Play for John Proctor Is the Villain on Broadway. She's also joining the MCU in Spider-Man: Brand New Day in 2026. Ambition, stacked carefully while the franchise window is still open.
Side Notes
Taylor Swift wrote the All Too Well short film specifically for her and said she wouldn't have made it if Sink had turned her down. That kind of co-sign at 19 doesn't happen by accident. She's been vegan since 2016, reportedly after watching a documentary and getting nudged by Woody Harrelson's family on a set. She also guards her personal life on principle. She's said publicly that the more people know about an actor's real life, the quieter the impact of their performances. For someone with that level of fame at 23, it's an unusually calculated stance.