What if Quicksilver lived?

Maybe include a team up with Makkari. My first idea was that we would get to see events play out with Quicksilver alive (Crossbones vs. Quicksilver in Civil War and Quicksilver vs Thanos in Infinity War). My second idea was that he could actually be abducted by the Runner for the Galactic Marathon.

What if Spider-Man didn't go to Doctor Strange?

Basically what everyone originally thought Spider-Man 3 was going to be: Spider-Man with bounty hunters after him including Kraven the Hunter. For this one, I would either have Kraven or Chance be the main villain. I would also include a lot of minor Spider-Man villains that would chase him and he could fight off.

What if ...Guardians of the Galaxy Holiday Special

Mantis and Drax would kidnap the wrong person. My main ideas were along the lines of Nightmare Before Christmas, so it would include Moon Knight and/or the Werewolf.

What if...Something to do with Tibius Lark

I haven't come up with a story to include him.

What if the villains were the good guys?

Iron Monger would kill Iron Man then he would be taken out by Whiplash, who came to reclaim the arc reactor tech and basically become a tech billionaire.

Vulture would also help expose Stark Industries for selling weapons to terrorists.

Darren Cross would use Pym Particles to help the world. This would basically be the deleted scene from "Ant-Man."

Kaecilius exposed the Ancient One without turning to Dormammu.

Crossbones could be the Hawkeye/Black Widow SHIELD agent member. He could still be a HYDRA agent.

Maya Hansen could have extremis powers.

Abomination who basically has the same motives as revealed in She-Hulk.

I don't really have a villain in mind. Maybe the Ten-Rings and they could include the Mandarin's armored car from the Iron Man 3 Lego set.

What if Maya Hansen was the villain?

Just because of the weird reason Marvel decided not to have her as the villain of Iron Man 3.