[#item_full_content] Sadie Sink’s casting in ‘Spider-Man: Brand New Day’ has intrigued MCU fans as speculation mounts around her role in the film. Though Marvel Studios and the ‘Stranger Things’ star have remained tight-lipped about her secret character, fan theories consistently point to her portraying Jean Grey, one of Marvel Comics’ most powerful and emotionally complex heroes. 
Read More
Who is Jean Grey? Everything to know about the Marvel hero rumored to be played by Sadie Sink in ‘Spider-Man: Brand New Day’
ByMarvelComicBooks.com
July 28, 2026