Most of the fan theories around Avengers 4 take us back to the Quantum Realm one way or the other. Many fans believe that the victory for Avengers is somehow tied to the Quantum realm. What we however forget is that 2016’s Doctor Strange actually did relate to almost all these theories.
Get back to the time when Stephen first learns from then Ancient One. She shows him how little he knows about the world around him and sends him on a journey through dimensions. The only dimension we saw again was the Dark Dimension.
It was later confirmed that the green looking world before the Dark Dimension was the Quantum realm. At this point, The Ancient One Says, “Some, benevolent and life-giving,” she says. “Others, filled with malice and hunger.”
The Comment on “malice and hunger” came as Stephen was passing through the Dark Dimension, alluding to the fact that she’s describing things to him as he sees them. With that in mind, the other half of the comment provides some pretty exciting context. When she says “benevolent and life-giving,” Stephen is travelling through the Quantum Realm.
Most of the theories about the Quantum Realm refer to it as a way of restoring life or holding onto the souls that were lost in the snap, essentially adopting some elements of Soulworld. The Ancient One’s comment in Doctor Strange provides evidence that these theories do actually hold some truth.
With Tilda Swinton’s Ancient One potentially returning in Avengers 4, there’s a possibility we could get an even deeper look into the powers of the Quantum Realm and how it helps Earth’s Mightiest Heroes take back the universe that Thanos tore apart.