It’s not that Gyllenhaal would’ve done poorly as Peter Parker, but rather that the role wouldn’t have made full use of his penchant for peculiarity. Perhaps thanks to his odd sense of humor, he’s proved adept at playing sometimes-charming wackadoodles with a darkness to them. If he were to appear in a Spider-Man movie, director Jon Watts and Marvel executives realized, it would have to be as someone more cunning and deceptive. Someone like Quentin Beck, known to the masses as Mysterio.
Watts’s “Spider-Man: Far From Home,” the Marvel Cinematic Universe’s second Spidey flick, introduces Beck as a caped, fishbowl-helmeted hero who aids S.H.I.E.L.D.’s efforts to thwart destructive monsters called the Elementals. Beck tells the agents he’s the lone survivor of an alternate reality where the Elementals annihilated everyone, including his family, so he has arrived to prevent them from wreaking the same havoc on this Earth. S.H.I.E.L.D. loops in Spider-Man (Tom Holland), and he teams up with Beck, whom Peter and his classmates later nickname Mysterio, to fight the Elementals throughout Europe.