WandaVision Finale Ending EXPLAINED
4. Wanda Reads From The Darkhold
Agatha puts a name to the book in WandaVision's finale during her fight with Maximoff, calling it the Darkhold. The Darkhold is a dark book of power in Marvel's comics and previously made its debut in Agents of S.H.I.E.L.D., albeit with a drastically different design and some lovely cursive on the front cover.
In the MCU it's where the prophecy of the Scarlet Witch is foretold, which makes sense, given the book's creator in the comics, Chthon, had a direct had in one of many Scarlet Witch origins Wanda was given over the course of her decades long history. Agatha states that the Scarlet Witch's power would rival that of the Sorcerer Supreme's, a role currently occupied in the MCU by Benedict Cumberbatch's Doctor Stephen Strange.
Wanda's next outing in the MCU is due to arrive in Doctor Strange in the Multiverse of Madness, and given her alignment with the supernatural side of things and the fact she is in possession of the Darkhold in the episode's post-credits scene, it stands to reason that the discovery she makes at the end of the episode will play directly into that film.
Speaking of that discovery (and I appreciate things are getting a bit non-linear here), the episode's post credits sequence sees Wanda reading from the Darkhold in a pose not all that dissimilar to how Strange perceives the multiple futures in Avengers: Infinity War. She also hears the voices of her two lost twins, Billy and Tommy, who in the comics found themselves reincarnated in the bodies of two other teenagers after initially having their souls absorbed by Mephisto.
It's a long story, but given Marvel Studios is currently assembling its own version of the Young Avengers through multiple series and films (Kate Bishop, Kamala Khan and Riri Williams are just a few of the young heroes set to make their MCU debut), it would make sense that Wanda's children return as their superhero alter-egos Speed and Wiccan.
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