The movie begins with Wanda Maximoff (Elizabeth Olsen) at her cabin in the woods.
>Mordo (Chiwetel Ejiofor) attacks her for the events of Westview, but Wanda defeats him.
>Mordo claims that he will never stop coming after Wanda. She says she knows and decapitates him.
>Teenager America Chavez (Xochitl Gomez) is chased by the demon Gargantos. Stephen Strange (Benedict Cumberbatch) and Wong (Benedict Wong) rescue her.
>Strange and Wong takes America to the Sanctum in New York City to search for a book of spells when Gargantos breaks through and kills them.
>America teleports away with Strange’s body as the universe collapses and ends up in the MCU, where Strange is attending the wedding of his ex-girlfriend Christine Palmer (Rachel McAdams).
>Gargantos attacks, looking for America, and Strange fights him. Wong arrives to help and distracts Gargantos long enough for Strange to impale him through the eye.
>America leads Strange and Wong to Strange’s dead variant and explains that she can create portals between universes, which made her a target of Gargantos.
>Wong deduces that someone summoned Gargantos and takes America to Kamar-Taj for protection, where they meet the minotaur Rintrah (Adam Hugill).
>Meanwhile, Strange visits Wanda in her cabin to ask for her help. She is evasive, and he feels the dark presence of the Darkhold and realizes Wanda summoned Gargantos.
>Wanda fights Strange and explains that her children, Tommy and Billy, are lost in the Multiverse and she needs the Darkhold to find them.
>Wanda is only able to possess the bodies of her variants and needs America to physically traverse the Multiverse.
>Strange argues that the Darkhold is warping Wanda’s mind, but she refuses to listen, and Strange is forced to teleport back to Kamar-Taj.
Strange warns Wong about Wanda. Wong tells Strange about the prophecy of the Scarlet Witch and claims that if Wanda is her, she must be killed.
>Strange refuses to accept this, convinced that he can cure Wanda instead.
>Wanda attacks the Kamar-Taj and wreaks havoc. Strange protects America while Wong and the sorcerers holds off Wanda.
>America can’t control her powers and accidentally teleports herself and Strange to a universe where Mordo is the Sorcerer Supreme. They ask for his help, but he abducts them instead.
>Mordo brings Strange and Wong before the Illuminati, a secret society that has assembled to protect the Multiverse.
>The Illuminati are Professor Charles Xavier (Patrick Stewart), Peggy Carter (Hayley Atwell), Monica Rambeau (Teyonah Parris), Balder (Bruce Campbell) and Mordo.
>Mordo believes Strange and America should be killed for endangering reality, but Xavier imprisons them instead under the supervision of a variant of Palmer.
>Meanwhile, Wanda possesses the body of her variant of the Illuminati’s universe and attacks their lair, killing Balder and injuring Carter and Rambeau.
>Xavier battles Wanda and nearly exorcises her, but she overpowers and kills him. Her dark presence causes her variants’ bodies to rapidly deteriorate.
>Strange escapes and is attacked by Mordo while searching for America, but manages to defeat him.
>Palmer rescues Strange and America and uses a bracelet to teleport them to another universe and retrieve a book of spells that can defeat Wanda.
>Wanda intercepts them, kidnaps America and abandons Strange and Palmer in a universe where his deranged variant, Strange Supreme, is the sole survivor.
>Meanwhile, the sorcerers retrieve the Darkhold and create a protective barrier around it to keep Wanda away.
>Wanda breaks through by inflicting nightmarish visions into the minds of the novice sorcerers and abducts Wong so he can lead her to the birthplace of chaos magic in Wundagore Mountain.
In Wundagore, Wanda harnesses America’s power and opens a portal to the universe where Billy and Tommy are.
>Wong realizes that Wanda is being manipulated by demons to weaken the cosmic barriers and plunge the Multiverse into chaos.
>Meanwhile, Strange fights Strange Supreme for the book of spells and defeats him.
>Strange possesses the body of his dead variant in the MCU and manages to teleport into Wundagore and talk to America, encouraging her to embrace her power.
>America manages to open a portal to bring Strange and Palmer into Wundagore, while Rintrah and the surviving sorcerers arrive to rescue Wong.
>To Wanda’s surprise, Billy and Tommy are living with a loving adoptive family in a farm, not in danger as the Darkhold influenced her into believing.
>Strange confronts her with the book of spells, but the demons compel Wanda to attack him and they battle across the Multiverse.
>Strange brings Wanda back to Wundagore, where he manages to free her from the influence of chaos magic with the help of his allies.
>The demons begin spreading through the universes. Wanda regains control and appears to sacrifice herself to destroy Wundagore Mountain and save the Multiverse.
>Palmer returns to her universe to reform the Illuminati, while Strange takes America as his apprentice, having developed a fatherly bond with her.
>In a post-credits scene, Strange begins realizes he is infected by chaos magic as well and begins experiencing visions similar to Wanda’s.
The reshoots reportedly added more cameos, including Tobey Maguire as Spider-Man, Hugh Jackman as Wolverine, Michael Fassbender as Magneto, Sophie Turner as Jean Grey, Ioan Gruffud as Mister Fantastic, Eric Bana as Hulk, Nicolas Cage as Ghost Rider, Chris Evans as Captain Hydra, Michael B. Jordan as Black Panther Killmonger and Tom Cruise as Iron Man, among others.
