Originally Posted by
Relugus
WandaVision, here's some spontaneous speculation:
Opening scene is perhaps of Sokovia when Wanda was child...there's jets flying over, the sound of machine gun fire, explosions, etc. Ruined city. The camera trails over a huge mountain, the mountain casts a huge, ominous shadow over the city, and in amongst that shadow we see a boy and girl running, frightened, into their home. Wanda and Pietro. A frightened Wanda sits down and turns on the TV, I Love Lucy comes on and her fear melts away and she smiles.
So, guessing early scene maybe Wanda is working with Monica Rambeau and SHIELD, we see a bit of Wanda helping them on a mission. Monica befriends her, we see them hang out.
Shuri rebuilds Vision but he has no emotions anymore. They return to Wanda's home. Vision is cold. Heartbroken, Wanda tries to imbue him with a soul, but instead he gets possessed by Chthon. Although Vision is back, Chthon is inside him and this brings up her fear of Chthon, which stems back to her birth. Chthon only possesses Vision when Wanda is absent, meet she sense him, get subconsciously, Wanda knows he is there, so she builds a pocket dimension out of her happiest childhood memory, the old US sitcoms she watched to make her fear and sadness go away. The pocket dimension is also a defensive barrier, protecting both Wanda and the world. Chthon uses Vision to send demons into Wanda's pocket world.
The logo shows a contrast between the two "I"'s in Vision; the first is White like the rest of the words, but the second has the Chaos Magic spark at it's head. Note that it is the second "i". Does the first "i" represent White Vision, while the second "i" represents the restored Vision.
Blade would relish the opportunity to get revenge on Chthon, and him moving around in a physical body and being in this world for long enough could lead to him being attacked by Blade. If the leaks were true (and they seem to be quite accurate), we might even see Blade fight Grim Reaper.
I think Agatha shows Wanda witchcraft and her eyes light up, and we see her love of magic blossom. This is what helps her to heal and especially grow as a person. Agatha opens her eyes to her own potential and is a teacher and mother figure.
As earning the title "Scarlet Witch" means attaining mastery of dark magic, that could mean defeating Chthon, in effect confronting her greatest fear and defeating it.