That has to be Reed Richards because a new Fantastic Four movie is in the works.
Also, because Wanda (Elizabeth Olsen) is dealing with magic, that also means Doctor Strange (Benedict Cumberbatch) has to show up.
We know that Olsen is part of the cast of Doctor Strange in the Multiverse of Madness, and so Doctor Strange had to appear in WandaVision.
That’s not even a question; the only question is when Cumberbatch was making his cameo appearance so that we could get ready for the next Marvel movie.
Even though it’s not next and doesn’t even come out until 2022, we need some kind of teaser.
If you don’t tease the next Marvel thing, then what are we even doing here?.
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