India, July 31 -- This article contains major spoilers for Spider-Man: Brand New Day. If you haven't seen the film yet, please note that we did try to warn you.

Brand New Day has finally answered one of the biggest questions surrounding Sadie Sink's mystery Marvel role. After months of speculation, the film confirms that the Stranger Things actor is playing Jean Grey, one of the X-Men's most iconic mutants.

But the movie also introduces another lesser-known Marvel character, Sara Grey, whose story becomes the emotional driving force behind Jean's actions throughout the film.

Who Is Sara Grey In Marvel Comics?

Sara Grey has been part of Marvel Comics for decades although she has rarely taken centre stage. She is Jean Grey's older siste...