Sadie Sink"s surprising Spider-Man 4 casting announcement supports my theory that the Stranger Things star is playing the X-Men hero Jean Grey in the MCU. The MCU"s Spider-Man 4 is advancing in development faster than other MCU sequels, and a lot may be at stake, both for Tom Holland"s Spider-Man journey and the MCU as a whole. Given that the chances of Zendaya"s MJ and Jacob Batalon"s Ned Leeds returning for the MCU"s next Spider-Man movie are low after Spider-Man: No Way Home"s ending, it"s likely that Holland"s Peter Parker will be joined by new friends in Spider-Man 4.
Sadie Sink Has Been Cast In Spider-Man And Speculation Points To Her Playing Jean Grey Sadie Sink Is The First Big Name To Join The MCU For Spider-Man 4 Custom image by Debanjana Chowdhury On March 12, 2025, Deadline reports that Sadie Sink has joined Spider-Man 4"s cast. Before Sink"s official casting was reported, it was heavily speculated that she would be playing a major MCU character soon, with the most popular theories revolving around the X-Men member Jean Grey. While these used to be fan theories, Sadie Sink"s Spider-Man 4 casting suggests that they may have had a solid basis all along.

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