Doctor Strange 2 Theory: Nightmare's Secret Plan Revealed?
2. Scarlet Witch's Madness
We really have to go back to what Wanda has been through at this point to understand why she'd still be a good target for Nightmare. When she was young, her parents were killed, she volunteered for experiments that killed countless other subjects, she saw her brother killed, accidentally committed mass murder, was betrayed by her friends and then had to kill her lover only to see him revived and killed AGAIN. If you think the end of Endgame left her just fine, you’ve not been paying attention.
This all aligns with the comics version of the character. Her powers on the page come with a dreadful caveat, because her powers are too great for her to comprehend and she never earned them. In Avengers #503, Doctor Strange said something of her that might well be the crux of her role in In The Multiverse Of Madness:
"Can you understand the delicate mindset of a woman, a person, who has control over reality. It means reality controls her. Imagination becomes the enemy. Structure disappears."
In effect, Wanda was so powerful she could mould reality however she wanted, to suit her. We don't know how much of that is true in the MCU just yet, but it could be that Nightmare recognises that she could do that, given more access to the extra-dimensional powers she could draw from. And if she's able to convince her to make changes to reality that help him - say for the small cost of helping him destroy Strange or open some doors within the multiverse that would indirectly lead to that - then he could also offer her the tools to get everything she's ever wanted.
Well, just a life with Vision, in other words.
As we know from the comics, Wanda creating a reality that suits her own desires can lead to catastrophic events, which will presumably be what is driving Doctor Strange's story in In The Multiverse Of Madness. But that film is only part of the story, because we've also been told that it and WandaVision are two parts of one story. They are inherently linked and there's a good reason why.
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