Gyllenhaal was first reported to be in talks for the role of special effects artist Quentin Beck, who becomes master thief-turned-supervillain back in May, and today the Oscar-nominated actor took to Instagram to confirm his role in the MCU.
The eight-second video shows Gyllenhaal holding up Amazing Spider-Man #311 (a classic), which featured Mysterio's return to the Wall-Crawler's life. As he lowers the book to bring his face in view, he lets out a Keanu-esque "Whoa," followed by a "what the f-" before the video's comically abrupt stop.
"I just realized I'm not playing Spider-Man," reads the caption.
This may be a playful nod to that brief period in 2003 when Tobey Maguire was trying to get a bigger payday for Sam Raimi's Spider-Man 2, and Sony called his bluff to the point where the studio actually met with Gyllenhaal as a possible replacement.
Anyway, 15 years gone and Gyllenhaal will appear as a villain in his first foray into the world of big-budget superhero movies. With the addition of Mysterio joining with Michael Keaton's Vulture and Michael Mando's Mac Gargan, who will almost certainly become Scorpion at some point, we're halfway to a gathering of the Sinister Six.
Though we know it'll be Gyllenhaal behind the big glass dome, exactly how Mysterio will factor into Far From Home's story is still a mystery. The sequel, directed by Spider-Man: Homecoming's Jon Watts, will split its time between New York City and Europe as Tom Holland's Peter Parker goes on an international field trip with his class.
Spider-Man: Far From Home will swing into theaters July 5, 2019.