The events of WandaVision come to a head, and the destinies of all who took part are determined.
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Wanda Maximoff attacks Agatha Harkness to break her hold on Billy and Tommy, before ordering her children into their house to shield themselves. Harkness reveals that she can absorb Wanda's chaos magic, attempting to strike a bargain: consume Maximoff's powers in exchange for allowing her to maintain the false Westview reality with her family.
After temporarily subduing Harkness, Maximoff is approached by White Vision, whom she recognizes as the original body. Unfortunately, he attempts to kill her, but Maximoff's Vision arrives to engage White Vision in battle. As Maximoff admits her regret to her Vision for the lack of honesty surrounding the Westview Anomaly, he reveals that he now understands the reason why she crafted her reality. The couple prepares to fight for their home- Wanda confronts Agatha while the two Visions fight in the skies.
Inside Harkness's home, Monica Rambeau is trapped by "Pietro Maximoff," who refuses to let her leave. She uncovers a document regarding ownership of the property, revealing that Harkness does not own the house, but rather "Pietro," whose real name is Ralph Bohner. Rambeau discovers that the puka necklace he sports is enchanted; after removing it, Bohner's mind is freed from the sorcery.
At the S.W.O.R.D. Retreat Base, Jimmy Woo is brought in handcuffs to Director Tyler Hayward, who boasts that without video proof from inside the Anomaly, he will be able to cover up his resurrection of Vision and his attempted termination of Maximoff. Woo threatens Hayward with FBI intervention, after which he is thrown into a hay bale. There, he frees himself from the handcuffs, before contacting his FBI allies at Quantico.
Harkness ambushes Maximoff at the town center, revealing that the Darkhold contains a chapter dedicated to the Scarlet Witch. According to the book, the Scarlet Witch is forged into existence, is not bound to a coven or incantation, and possesses magic surpassing that of the Sorcerer Supreme. The Scarlet Witch is destined to destroy the world. As Maximoff attempts to reject any correlation to legend, Harkness releases every citizen from Maximoff's enthrallment, who immediately guilt her with pleadings and questions about their loved ones. Overwhelmed, Maximoff bursts into anguish, her magic creating bands around each person's necks and beginning to suffocate them. Back at home, Billy senses his mother's outburst, prompting him and Tommy to rush over.
Maximoff quickly reverses the choking spells, and as the citizens beg for their release, she begins to destroy the Hex. The barrier opens up, and Hayward orders his troops into Westview to eliminate Maximoff. As the reality dissipates, Maximoff's Vision, Billy, and Tommy begin to disintegrate, leading her to stop the process. As the Maximoff family reunites, they are confronted by Harkness, White Vision, and Hayward's platoon of troops. Harkness attacks the troops, lifting them in the air, but Maximoff helps to break their fall. Maximoff and Vision leave to continue their confrontation with Agatha and the white alternative, respectively, leaving the children to fend off Hayward.
With Billy's telekinesis and Tommy's super-speed, they redirect the troops' aim toward Harkness, prompting Hayward to emerge from his vehicle, intending to shoot and kill the children. Rambeau rushes in and uses her body to block the bullets; she fails to block one, but Billy's telekinesis stops it. Hayward attempts to use his vehicle to ram the three, but is stopped by a food truck driven by Darcy Lewis.
The two Visions' duel leads into the public library, where they halt fighting to negotiate peacefully. White Vision declares that his prime directive is to "destroy The Vision," and both admit to not being the true Vision; White Vision does not have the Mind Stone nor memories, while Wanda's creation does not possess original material. Wanda's Vision suggests that the original Vision's memories are being stored away for the sake of a more easily-controlled sentient weapon. Wanda's Vision restores the memories of White Vision, freeing him of S.W.O.R.D.'s control. His past life restored, White Vision realizes that he is now the "Vision", and promptly flies away from Westview.
As Maximoff's Vision reunites with his children, Maximoff ambushes Harkness, subjecting her to a hallucination, revisiting her 1693 trial and attempted execution. As the corpses of the deceased witches begin to reanimate, they recognize Maximoff as the Scarlet Witch, the Harbinger of Chaos. As Maximoff is tied to the stake, Harkness offers to keep Westview in her false reality in exchange for Maximoff's power. Maximoff seemingly accepts the bargain, transferring the chaos energy and her life force to the witch. However, this is revealed to be a hoax, as Wanda had cast the same runes Harkness had used in her basement to nullify her magic on the walls of the Hex. She proceeds to absorb a powerless Harkness's magic, morphing into the Scarlet Witch as depicted in legend.
Harkness warns Wanda about her unparalleled power, offering herself as a tutor for the Scarlet Witch. However, Maximoff instead places Harkness under a spell that reverts the witch's personality and appearance to her 'Agnes' character, trapping her in Westview. The Hex begins to shrink and reverse its reality overwrite across town, and the Maximoff family returns home for a final time. Maximoff bids farewell to her children, thanking them for choosing her to be their mother. As normality creeps up to the Vision Residence, Maximoff and Vision prepare to bid each other goodbye. Vision voices wonder at the nature of his existence across time: first a voice with no body, then a body but not human, and now a memory. He wonders what his next form will take as he and Wanda profess their undying love.
The Hex fully dissipates, and with it, the house, Vision, Billy, and Tommy. Walking through the Westview town center once more, a hooded Maximoff's former thralls scowl at her as she returns to see Rambeau, who reveals that given her power, she would've brought her mother back. Maximoff apologizes for her actions, admitting that there is still much for her to learn about her power. As authority figures arrive, the two women say goodbye to each other. Maximoff then flies away from Westview, observing the welcome sign one last time before departing.
In a mid-credits scene, Rambeau reunites with Woo as he takes over the Westview investigation from Hayward, who is escorted out in handcuffs. She is called into the local theatre by an FBI agent, who reveals herself to be a Skrull sent by an old friend of her mother regarding an intergalactic mission. In the post-credits scene, Maximoff is now living in the wilderness by herself, studying the Darkhold. Suddenly, Maximoff is pulled from her readings by the sounds of Billy and Tommy crying out for her help.
- Elizabeth Olsen as Wanda Maximoff/Scarlet Witch
- Paul Bettany as Vision / White Vision
- Debra Jo Rupp as Sharon Davis/"Mrs. Hart"
- Teyonah Parris as Monica Rambeau
- Evan Peters as Ralph Bohner/"Pietro Maximoff"
- Randall Park as Jimmy Woo
- Kat Dennings as Darcy Lewis
- Kathryn Hahn as Agatha Harkness/"Agnes"
- Julian Hilliard as Billy Maximoff
- Jett Klyne as Tommy Maximoff
- Josh Stamberg as Director Tyler Hayward
- Emma Caulfield Ford as Sarah Proctor/"Dottie Jones"
- Jolene Purdy as Isabel Matsueda/"Beverly"
- David Payton as John Collins/"Herb"
- David Lengel as Harold Proctor/"Phil Jones"
- Asif Ali as Abilash Tandon/"Norm"
- Selena Anduze as Agent Rodriguez
- Amos Glick as Dennis the Delivery Man
- Kate Forbes as Evanora Harkness
- Lori Livingston as FBI Skrull Agent
- Chase Yi as EMT
- Shane Berengue as Tactical S.W.O.R.D. Agent (uncredited)
- Isaiah Knott as Townsperson (uncredited)
- Wayne Riggan as S.W.O.R.D. Air Force Officer (uncredited)
- Paul Trunz as Townsperson (uncredited)
- Tony Lazzara as Townsperson (uncredited)
- Vladimir Tevlovski as Townsperson (uncredited)
- Tommy Rosales as Townsperson (uncredited)
- Tim Mikulecky as Townsperson (uncredited)
- Brandon Davis as Townsperson (uncredited)
- Tarah Paige as Townsperson (uncredited)
- Heath Hensley as Townsperson (uncredited)
- Amanda Hall as Townsperson (uncredited)
- Justin Ellings as Townsperson (uncredited)
- Todd Bloomer as Townsperson (uncredited)
- Mark Wagner as Townsperson (uncredited)
- Kevin Foster as Townsperson (uncredited)
- Alice Rietveld as Witch (uncredited)
- Sierra Hoyle as Witch (uncredited)
- Neraida Bega as Witch (uncredited)
- Cina McKenna as Witch (uncredited)
- Noelle Mulligan as Witch / S.W.O.R.D. Tactical Team (uncredited)
- Vanessa Vander Pluym as Witch (uncredited)
- Sarah Molasky as Witch (uncredited)
- Alex Smith as S.W.O.R.D. Tactical Team (uncredited)
- Craig Baxley, Jr. as S.W.O.R.D. Tactical Team (uncredited)
- Jay Lynch as S.W.O.R.D. Tactical Team (uncredited)
- Marilyn Giacomazzi as S.W.O.R.D. Tactical Team (uncredited)
- Rex Reddick as S.W.O.R.D. Tactical Team (uncredited)
- Richard Burden as S.W.O.R.D. Tactical Team (uncredited)
- Timothy Rigby as S.W.O.R.D. Tactical Team (uncredited)
- Tom Harper as S.W.O.R.D. Tactical Team (uncredited)
- Tom McComas as S.W.O.R.D. Tactical Team (uncredited)
- Ben Scott as S.W.O.R.D. Tactical Team (uncredited)
- Chris Patton as S.W.O.R.D. Tactical Team (uncredited)
- Molly Culver as S.W.O.R.D. Tactical Team (uncredited)
- Janey Hahn as S.W.O.R.D. Tactical Team (uncredited)
- Jeremy Fry as S.W.O.R.D. Tactical Team (uncredited)
- James Mitchell-Clyde as S.W.O.R.D. Tactical Team (uncredited)
- Roman Mitichyan as S.W.O.R.D. Tactical Team (uncredited)
- Westview, New Jersey
- S.W.O.R.D. Retreat Base, New Jersey
- Wanda Maximoff's Hideout, Sokovia
- New York City, New York (memory)
- Avengers Tower (memory)
- Johannesburg, South Africa (memory)
- Novi Grad, Sokovia (memory)
- Novi Grad Church (memory)
- Golden City, Wakanda (memory)
- Wakanda Medical Center (memory)
- New Avengers Facility, New York (memory)
- Schkeuditz, Germany (memory)
- Leipzig-Halle Airport (memory)
- Edinburgh, Scotland (memory)
- Salem, Massachusetts (vision)
- Quantico, Virginia (mentioned)
- Westview Anomaly
- Ultron Offensive
- Infinity War
- Avengers Civil War
- Infinity Stones
- Enchanted Necklace
- Bulletproof Vest
- Squeaky Shine (poster)
- Fresh-O (poster)
- Hydra Soak (poster)
- Westview Dairy Milk (poster)
- Big Red
- Oz the Great and Powerful
- Iron Man Armor: Mark XLV (memory)
- Iron Man Armor: Mark XLIV (memory)
- Arc Reactor (memory)
- Regeneration Cradle (memory)
- Kimoyo Beads (memory)
- Mjølnir (memory)
- Asgardian Armor (memory)
- Ultron Sentries (memory)
- Infinity Gauntlet (memory)
- Ant-Man Suit (memory)
- Pym Particles (memory)
- Bees (mentioned)
- Sorcerer Supreme
- Maria Rambeau
- Nick Fury (indirectly)
- Sarah Proctor's Daughter
- Isabel Matsueda's Husband
- Iron Man (memory)
- Hulk (memory)
- Shuri (memory)
- Ultron (memory)
- Thor (memory)
- Thanos (memory)
- Ant-Man (memory)
- Steven Seagal
- Ship of Theseus
- This is the first and only WandaVision episode to have both a mid-credits scene and a post-credits scene.
- Wanda Maximoff finding just a pair of boots where Agatha Harkness stood after throwing a car at her is a reference to the death of the Wicked Witch of the East in the The Wizard of Oz.
- The philosophical confrontation between Vision and White Vision about the Ship of Theseus' Paradox is a direct reference to the comic book issue Avengers Vol. 1 #6, where a future version of the Vision uses the Paradox to contest his present counterpart of them being the same being after millennia of cybernetic replacements.
- The episode reintroduces the Darkhold with a new design.
- The post-credits scene where Maximoff reads the Darkhold has a subtle hint at Doctor Strange's main theme, teasing Doctor Strange in the Multiverse of Madness.
- In an interview, Matt Shakman said that a scene was filmed in which Monica Rambeau, Ralph Bohner, Billy, and Tommy Maximoff went into the basement of Ralph Bohner's House, intending to steal the Darkhold, only to be attacked by Señor Scratchy, would have turned into a demonic figure. The scene was not used because it was considered "a huge detour in the middle of everything" and thus the VFX was never finished.
- Doctor Strange was originally planned to appear in the final episode, but the character was removed to keep the focus on Scarlet Witch.