Wandavision is a spin-off series of Avengers Franchise which will hit hard the Disney+ in 2021. Currently, the fantasy superhero drama is underproduction.
So, our Scarlet Witch, the Wanda is going to have her own series alongside her love, Vision. But if we get back to the events of Avengers: Endgame, the time travel sequence changed the whole fate of humanity along with Avengers, and so of Wanda and Vision.
In Avengers: Age of Ultron, we saw from an infinity stone got from Loki’s sword, Avengers made Vision, an android with supernatural powers. The vision then becomes a part of Avengers and Wanda, the Scarlet Witch’s love interest. Anyhow, in the Infinity Wars, Thanos ended-up killing Vision while putting off the infinity stone from his head.
Consequently, on the other hand, in the Endgame, we saw the Avengers trying the time travel thing to go back in the past and capture the stones before Thanos could get them. So, we saw the Avengers went back in 2012, and get the infinity stone but they failed. Then, they went back in 1970 to bring the infinity space stone and after bringing all the stones they tend to change the past and succeed.
Meanwhile, everyone who vanished and died in the way to fight with Thanos gets back to life but Vision was nowhere. Moreover, we saw Wanda telling Thanos that he snatched everything from her and we all know by this she meant, he snatched Vision from her.
Now, the question arises, if Wandavision follows the timeline after the events of Avengers: Endgame, how Vision will be able to be in?
Will Wanda do some magic or try something else to resurrect Vision may by using the Space Stone as before?
Or it might be possible that Vision was there alive but they didn’t show him in the Endgame as in 2014 Loki escaped with the stone, and that hints towards the making of Ultron alongside Vision.