If Sadie Sinks is playing THIS character in Spider-Man 4, the internet may implode.

This Sadie Sink casting theory completely flips the idea of whatSpider-Man 4could be on its head.

However, a fan theory has gained momentum, leaning into the previously established multiverse rumors.

Spider-Man and Sadie Sink

Is Sadie Sink Playing Mayday Parker?

In fact, if Mayday Parker were ever brought to live-action, Sink would be the perfect casting.

In Marvel Comics, Mayday Parker is the daughter of Peter and Mary Jane Parker from an alternate future.

Mayday Parker in Spider-Verse 2

Mayday was recently seen as a baby inSpider-Man: Across the Spider-Verse.

With Spider-Man 4 releasing betweenAvengers: DoomsdayandSecret Wars, that greatly increases the chances that Tobey Maguire appears.

Spider-Man 4swings into theaters on July 31, 2026.

Kirsten Dunst and Tobey Maguire

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