WARNING: The following article contains spoilers for Spider-Man: Far From Home, in theaters now.
In Spider-Man: Far From Home, the character Quentin Beck/Mysterio purports to be a hero from an alternate version of Earth. Since this was first mentioned in the film's promotional material, fans have been skeptical, theorizing that Beck was simply lying (much like his comic book counterpart would,) with some even going as far as to assert that the multiverse would not be introduced to the Marvel Cinematic Universe in Far From Home.
Of course, the film reveals Beck's story is, in fact, a con meant to trick S.H.I.E.L.D. and Spider-Man into letting their guard down. However, Marvel Studios president Kevin Feige assures that Beck lying and the multiverse existing are not mutually exclusive, citing the fact that the multiverse was actually first established back in 2016's Doctor Strange.
In a new interview with Fandango, Feige was asked if Beck's backstory being revealed as a ruse means we'll never actually see the multiverse come into play in the MCU. He replied, "No, it just means he was full of sh-t."
Feige continued, "I mean, in Doctor Strange, we hear the Ancient One talk about the multiverse, so we've already established it as a thing."
To Feige's point, there is a sequence early in Doctor Strange where the Ancient One informs Stephen Strange, in no uncertain terms, that the universe he resides in is "only one of an infinite number." Furthermore, she directly uses the term "multiverse" later on in that very same sequence.
That being said, with Far From Home going the bait-and-switch route, it is still unclear exactly how these alternate realities will play into the MCU's future. Some fans speculate the multiverse will be instrumental to introducing Disney's newly-acquired Fox properties. However, Marvel Studios has yet to officially comment on the matter.
With Far From Home now in theaters worldwide, the MCU's immediate future is expected to be addressed at Comic-Con International: San Diego in the coming weeks.