Sadie Sink Brand New Day Character Theory

I think that Sadie will play… a young adult Mayday Parker, the daughter of Tobey Maguire’s Spider-Man and Kirsten Dunst’s MJ. I think that when the multiverse was breaching at the end of NWH and the figures were seen in the cracks, Mayday was pushed through the cracks before they were closed due to Doctor Strange’s spell that made everyone forget that Holland’s Peter Parker was Spider-Man. In BND, Mayday will know that Peter is Spider-Man because the spell made everyone forget that the Earth-19999/Earth-616 (which ever one it is) variant of Peter Parker is Spider-Man, but she knows that her dad is Spider-Man from her own universe so she will look for Spider-Man and helps him in whatever situation he ends up in. She also will want to find her way home back to her parents. This also helps the rumours that Tobey Maguire will be in Doomsday and Sadie Sink will be in Secret Wars. Maybe Tobey will be investigating Mayday’s disappearance throughout the multiverse somehow and they will reunite in Secret Wars. What do you guys think?

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TheDepressedSolider2025-11-18 21:48

Or Jean grey

Substantial-Use9192025-11-18 21:49

I don’t think they would introduce Jean Grey, in a Spider-Man movie

TheDepressedSolider2025-11-18 21:56

Well she’s casted for avengers Secret wars as well .

Hylianhaxorus2025-11-18 22:21

Which adds more to her being Mayday honestly. I think this OP has it totally wrong, but I do think thats who she's playing. I figure she will be a supporting cast member and maybe classmate to Peter and by the end of the film it will be revealed to us or maybe even Peter, that she's Tobey's daughter, and was visiting this universe out of curiosity, or maybe even her and her dad had a fight about her being Spider-Woman and she wanted the perspective of a spider-man that isn't her dad. I expect it to be brief reveal that leads into her and her dad teaming uo in doomsday and maybe a slider-man 4 starring her eventually.

SeekerVash2025-11-19 01:10

They introduced Spiderman and Black Panther in a Captain America movie right? Why not Jean Grey in a Spiderman movie?

FictionFantom2025-11-18 22:04

In camo cargo pants and tactical boots?

Like is there literally any reason why anyone thinks she’s Jean Grey besides the red hair?

Altruistic_Eye_11572025-11-18 21:49

Well... I don't really see the point. The rifts didn't allow anyone in anyway, because Strange closed them in time, and even if someone had slipped through, Mayday would have instantly pulled them back to her universe with the counter-spell. It wouldn't make sense that it would work for everyone but not for her.

Secondly, as far as we know, Holland is the only one who has operated as Spider-Man in these almost three years. In Born Again, they only mention a man in a spider suit. If they had planned to include Mayday (and remember, according to the Born Again team, they were asked to add Spider-Man elements), they would have said something like "people" or even "men and girls dressed as spiders."

And as far as we've seen, Sink isn't part of the tank chase, the fight against Scorpion, the prison break, etc. So far, the only time we've seen her is in civilian clothes, being immobilized and arrested. Nothing in the production indicates that she's another Spider-person.

Furthermore, as far as we know, the story won't contain prominent multiversal elements, and Mayday wanting to return to his universe is extremely important, I think. Besides, according to Doomsday rumors, Tobey's appearance would be brief and perhaps only in the first act.

Fickle-Ad-71242025-11-18 22:04

They need to do less with the Strange spell storyline, it makes no sense, it’s full of plot holes and inconsistencies, and they need to move on.

Hollywood4442025-11-18 22:18

The rumor now is she’s playing Madelyne Pryor in both movie

cheezyfilms2025-11-19 00:33

Madelyn Prior makes no sense.

Hollywood4442025-11-19 00:35

Completely agree

americnwerewolfinLDN2025-12-18 15:30

I can tell you, for sure, 100%, she is Madelyn Pryor. She'll be Jean moving forward.

D20_Buster2025-11-18 22:18

I hope she is Firestar. Long shot but seeing Spider-Man and his amazing friends would be great.

Substantial-Use9192025-11-18 22:19

That would be good too

Antrikshy2025-11-18 23:57

This would be great.

Many years ago, someone suggested introducing FF via Johnny Storm being Peter's friend/roommate. This would be like that, slightly.

FlyingTrilobite2025-11-19 00:19

Same. Really hope this is what they’re up to.

Spider-Man2222025-11-18 22:19

Plot hole in your theory:

If Mayday is in 616 because of Doctor Strange’s spell, why would she wait several years before contacting Peter and letting him know that she come from Peter 2’s universe seeing as how NWH took place in 2024 and Brand New Day takes place in 2027.

PezDiSpencersGifts2025-11-19 01:44

How would she know to contact Peter? No one knows who he is

dpittnet2025-11-19 00:54

Nah

General_Boredom2025-11-19 01:22

I really wish Marvel just said “She’s playing a new character, so and so” and then there’s a big reveal in the movie because my god, this endless speculation as to who she could be playing is getting tiring.

breyness2025-11-19 03:41

Best I saw someone saw was squirrel girl