The latest and fourth episode of WandaVision had ended up with a lot of questions to viewers. A scene of the fourth episode brings up the question about vision’s existence. Is he Dead or Alive? In the latest episode after Wanda expelled Geraldine aka Monica Rambeau from Westview after Monica mentions Ultron and Pietro’s death and Wanda recognizes that threat, It also revealed the extent of Wanda’s control of her environment, suggesting that she is able to snap out of the fake reality to deal with threats to its sanctity. As a result, Wanda kicks Monica out of the bubble with a threat. And before she’s able to pull the magical mask back up, Vision returns home and she sees him as a reanimated corpse, hinting that he is in fact dead and Wanda is using his body as a puppet.
In the Endgame, Wanda had seen her beloved Vision killed (after killing him herself) and her chance of happiness being ripped from her. WandaVision episode four confirmed that Wanda’s return from Hulk’s snap in Avengers: Endgame was instantaneous (as if she’d “fallen asleep”) and after her return, she was thrust into a battle for her life. With the Disney+ show immediately following ‘Endgame’, Wanda is very much still in the immediate mourning period for Vision, so her trauma is still very fresh, which appears to be why she’s built a fake reality around her to hide from the truth.
As we know Wanda’s powers extend to telekinesis. She can manipulate matter, Wanda can create matter from nothing which will be allowing her to puppet Vision’s corpse. The grim puppet was obviously retrieved from where Vision fell in Wakanda, and a scrapped. ‘Endgame’ post-credits scene would have shown Scarlet Witch opening Vision’s body bag to add to the idea.
At the end of episode four, immediately after that horrific vision, everyone’s favourite robot tells Wanda that, “We can go wherever we want.” Wanda quickly refutes this, telling him that they can’t leave Westview. “This is our home,” she continues. “Don’t worry darling. I have everything under control.” Wanda may claim that she is in control, but her emotions are clearly guiding her and her grief is clouding her judgment. The implication here is that whenever her version of this world fades away, Vision will fade away along with it. So Vision is alive in a sense, but only as long as Wanda’s fantasy remains real. And if that’s true, then this isn’t even the Vision we know, it’s an idealised facsimile born of Wanda’s grief.