It was already challenging enough to keep up with the 27 films and half-dozen Disney+ TV shows in the Marvel Cinematic Universe. But now, in “Doctor Strange in the Multiverse of Madness,” out Friday, you also have to keep track of multiple versions of Dr. Strange (Benedict Cumberbatch) and Wanda Maximoff (Elizabeth Olsen), also known as the Scarlet Witch. And who knows who else — it is the multiverse, after all, so there are multiple versions of, well, everyone.
The trailers for “Multiverse of Madness” have made it out to be a crossover event that’s maybe not “Avengers: Endgame”-level, but certainly close. Eagle-eyed fans will have spotted connections to “WandaVision,” “Loki” and even zombie versions of a few characters, apparently from Episode 5 of the lesser-known Disney+ animated series “What If … ?,” as well as the M.C.U. debut of Patrick Stewart’s Professor X, the founder of the X-Men.