In a mid-credits scene, Strange is happily strolling through Manhattan's streets, having seemingly accepted the corruption caused by his use of the Darkhold. He's intercepted by a blonde sorcerer in a purple and pink costume (Charlize Theron). She opens a portal to the Dark Dimension, the hellish reality ruled by 2016 Doctor Strange big bad Dormammu.
"You created an incursion and we're gonna fix it... unless you're afraid?" she says.
"Not in the least," he responds, his Darkhold-induced third eye opening.
What does it mean?
She isn't named until the credits start rolling after this scene, but Theron's character is Clea -- a Dark Dimension magic wielder who's been in the comics since the '60s.
She's the daughter of Dormammu's sister Umar and Dark Dimension Prince Orini, and became fascinated by Strange during one of his early adventures in that reality. Their paths have crossed many times in the years since, with Clea becoming Strange's student and later his wife.
You might have been too busy reeling or screaming with joy when Reed Richards (John Krasinski) explained what incursions were earlier in the movie, but they're catastrophic events that occur when a multiversal reality crashes into another. In the comics, this happened in 2015 event Secret Wars.
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It's unclear how Strange caused an incursion -- he jumped through a whole bunch of realities in Multiverse of Madness -- or what this means for the MCU, but it could see elements from a different cinematic universe crossing into this one.
Such a crossover already created a dangerous scenario (filled with delightful cameos) in No Way Home, so it's possible we'll see characters from Fox's X-Men reality next. The presence of Professor X (Patrick Stewart) may have been foreshadowing this.
In an alternate reality's Manhattan, rude street vendor Pizza Poppa (Bruce Campbell) earlier accused America Chavez of stealing his precious dough balls. Strange hit the poor guy with a spell to get him off their backs, and they left him to be attacked by his own hand.
The post-credits scene brings us back to Pizza Poppa just as his meat hook's campaign of violence ends.
"It's over!" he says joyously.
What does it mean?
This scene is unlikely to have any MCU-scattering implications, since it's more of an homage to Campbell and Raimi's relationship. The pair have been friends since high school, and the actor played hero Ash Williams in Raimi's 1981 breakout feature The Evil Dead. In that movie's 1987 sequel, Ash's hand is bitten by one of the undead, becomes possessed and tries to kill him.
Unlike Pizza Poppa, he tries to solve the problem by severing his hand and replacing it with a chainsaw (which is extremely metal). His former hand stalks him for the rest of the movie.
Campbell also shows up in Raimi's non-MCU Spider-Man trilogy, seemingly playing three different characters. He was a wrestling announcer in the first movie, a snooty usher in the sequel and a French maître d' in the third. If the scrapped Spider-Man 4 had come to fruition, the actor could have played Mysterio, Raimi confirmed to Rolling Stone.