Sadie Sink in Spider-Man 4: Jean Grey or Mary Jane? MCU Casting Breakdown!

Sadie Sink, the 22-year-old breakout star from Stranger Things (hands down my opinion the best Netflix original!), is officially joining Tom Holland in Spider-Man 4, set to swing into the Marvel Cinematic Universe (MCU) in 2026. But who will she play? Marvel’s keeping it hush-hush, sparking wild theories—could she be the iconic Mary Jane Watson or the X-Men’s omega-level psychic Jean Grey? In this video, I dive into the latest casting news as of March 19, 2025, break down an article from ComicBook.com, and share why I think Sadie Sink is perfect for Jean Grey. Imagine her kicking off the MCU’s X-Men era with a Dark Phoenix arc spanning years—epic, right? Or should she stick to Spidey’s world as MJ? Let’s unpack the possibilities, from multiverse variants to mutant introductions, and why this could be a game-changer for Marvel, Sony, and Disney. Drop your thoughts below—Jean Grey, Mary Jane, or someone else? Hit that like button, subscribe for more Geek stuff coverage