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Brand New Day is already full of villains, but some fans have suggested that Sink’s character could add one more to the roster. There have been rumors that she is playing antagonists like Typhoid Mary or Shathra. Others have suggested that she could be a new MCU hero like Jean Grey or Firestar. The possibilities are nearly endless, but I think that the evidence strongly leans in one direction.
The Secrecy Surrounding Sadie Sink’s Character Suggests She Is Jean Grey

Of all the characters that Sadie Sink could be playing, Jean Grey is easily the most high-profile. She is one of the main X-Men, is recognizable, and is one of the most significant female heroes in Marvel Comics. Sink’s role as Jean Grey would suggest that she will go on to star in projects centered on the X-Men and mutants, and would be involved with some of the MCU’s biggest future storylines. If Jean Grey does appear in Brand New Day, this would change the MCU forever, something that can’t be said for the other characters.
While some of the other rumored Sink roles are fun, none of them are nearly as significant as Jean Grey. Typhoid Mary, Shathra, Firestar, and the rest are deep-cut Marvel Comics characters, and while they have some fans, they don’t warrant all of this secrecy. It would be cool to see Firestar in the MCU, but she wouldn’t have that much of an impact on the broader universe, so it just doesn’t make sense to keep her appearance in the film under wraps.
So, the fact that Marvel is being so secretive suggests that Sadie Sink is actually playing Jean Grey. While this isn’t strong evidence, it is enough to at least be a point in Jean’s favor. The MCU is rarely this secretive about major supporting characters in solo superhero films, so Sink’s character must warrant an extra level of it. Luckily for X-Men fans, Jean Grey does.
On top of all this, Marvel has to know how much speculation keeping Sink’s role a secret would cause. As projects like WandaVision have shown, the reception of a show can be hurt by fan expectations getting out of control. The team at Marvel Studios has to know that they risk doing this by keeping Sink’s role a secret, and that fans would be immensley disappointed if she is only playing a character like Shathra. Marvel is smarter than this, which is why Sink is probably playing Jean Grey.









