WARNING: CONTAINS SPOILERS
As you may know, there was extreme backlash from the MCU fandom on the internet when Spiderman was set to leave the MCU due to the failed deal between Disney and Sony. Thankfully, Sony has allowed Disney to make the third Spider-Man MCU movie, but nothing is known about this movie yet so it doesn’t hurt to make theories. Here are a few. Please keep in mind that these are all theories and there is no truth behind any of them at the moment.
Symbiotes- If this movie takes place before Doctor Strange and the Multiverse of Madness, then Sony and Disney could introduce Venom and more symbiotes to the MCU. Sony has been wanting to cross Spider-Man with Venom ever since Spider-Man made his MCU debut. The storyline could have Peter Parker trying to fight off Venom while he tries to corrupt the world in symbiote and later teaming up with Doctor Strange to takedown Venom and the symbiote army. By doing this, Sony and Disney now with their 50/50 deal could gain tons of money from this cross over.
Sinister Six- Marvel has been wanting a Sinister Six movie ever since the Raimi era of Spider-Man movies. This group has changed over the years but has mainly featured Dr. Octopus, Electro, Kraven the Hunter, Mysterio, Sandman, and Vulture. With this being, the MCU would most likely select Chameleon, Vulture, Scorpion, Shocker, The Tinkerer, and Green Goblin. During the end of Far From Home it was revealed that Avengers tower was being formed into Oscorp. Oscorp is a multi-billion dollar company that makes advanced scientific weapons and technology and is run by Norman Osborn.
Skrulls- After Mysterio revealed Spider-Man’s secret identity to the world in the Spider-man Far From Home, lots of questions appeared on how Spider-Man’s storyline in the MCU was going to play out. However, the solution is very simple. At the end of FFH, Nick Fury was revealed to be in space and Talos the skrull had taken his place in the real world. Since skrulls can shapeshift into anyone and Peter can’t be in two places at once, Talos can transform into Peter to prove he’s not Spider-Man while Peter is out saving the world and taking down the new threat to New York.
Green Goblin- Once the Avengers tower was revealed to be Oscorp Tower in FFH, soon came the existence of Norman Osborn who is the owner of the company and is the Green Goblin. He has posed a threat to Spider-Man for years and once killed his girlfriend, her dad, and even Spider-Man himself. This is one of the toughest enemies that Spider-Man has ever faced and has an entire company in the palm of his hand.
Chameleon- After Peter’s identity was revealed, Spider-Man’s problems just keep growing. If Sony and Disney want to make tons of money at the box office then introducing Chameleon may just be the right move. In the comics, Chameleon used his powers to shapeshift into Spider-Man to cause problems for him by giving a bad reputation as the Wall Crawler. With Peter’s problems getting worse every movie, the addition of the Chameleon will be the cherry on top everyone needs and the toughest challenge for Peter.
The theories go on and on, and naming all of them would be pretty cool but take way too long. None of these are confirmed to be true and there is no official information about the plot of Spidey’s third MCU film, so until then we only have theories to go off of.