Doctor Strange in the Multiverse of Madness introduced Earth-838's Illuminati, and the debut of John Krasinski as Mister Fantastic made a lot of fans very happy. It's unclear whether The Office alum will reprise the role in Marvel Studios' Fantastic Four reboot, but if this was it for him, there's no denying the actor's cameo was a memorable one.
Talking during the Director's Commentary for the sequel (via The Direct), director Sam Raimi credited Marvel Studios President Kevin Feige with making Krasinski's involvement a reality, saying he was looking for a way to make the dreams of fans come true with this casting. Whether that was a one-time thing or the plan for the MCU moving forward obviously remains to be seen for now.
Regardless, when Reed Richards joined his fellow Illuminati members, it was through a teleportation device many fans believe might have been a nod to how the TVA travelled through time in Loki.
Instead, it was the MCU's first Doctor Doom reference.
"It’s exciting that costume designed by Ryan Meinerding, is a really special treat," co-producer Richie Palmer chimes in. "The detail of the teleportation device he uses to get into the scene is something we took from the comics, that’s Doctor Doom’s Time Platform."
This more directly connects Doctor Doom and Kang the Conqueror, two characters who have an awful lot of history in the comic books. There are many conflicting stories about their connection, with Kang sometimes believing himself to be a descendant of Doom. They've both utilised the same technology, though, so you can probably see how that Time Platform might come into play.
In the MCU, Kang may have stolen the Platform from Doom or even used his early ideas to master the ability to travel through the Multiverse. On this specific world, though, Reed appears to have taken it and found a way to turn it into a simple teleportation device. Ultimately, it's a fascinating Easter Egg, and one that we expect to see revisited in some form down the line.
While Doom ended up being treated appallingly in the last three Fantastic Four movies, the expectation is that Marvel Studios will do something with the villain quite soon. There have been rumblings of a Disney+ series or even a cameo in Black Panther: Wakanda Forever, but it's time for the villain to step out of the shadows and establish himself as a major threat in this world.