WandaVision: 8 Characters Who Could Still Make A Shocking Appearance
3. Tom Holland's Spider-Man
It would seem that the Doctor Strange sequel isn't the only upcoming Phase Four movie that will be dealing with the multiverse. Judging from the cast list for Spider-Man 3, with characters returning from the previous two Spidey franchises, and Doctor Strange himself set to appear, Jon Watts' third entry in the series will tie into the Multiverse of Madness, and therefore WandaVision as well.
If the theory of Wanda tearing a rift in the universe and opening the doors to the multiverse proves true, she will directly be affecting the events of Tom Holland's next outing. She would be the reason Doc Ock, Electro, and possibly more could make their way into the MCU.
An appearance from Spider-Man before the end of WandaVision wouldn't be too unreasonable then, in the same way a Doctor Strange cameo would make sense. The two characters are likely to cross paths in the very near future, so why not have them meet as early as possible?
Particularly taking into account the fact that Elizabeth Olsen has recently refused to rule out an appearance in the untitled third Spider-Man movie, it's difficult to rule out Holland showing his face in New Jersey over the next few weeks.