7. Reed Richards Turned Skrulls Into Cows
If you're curious about why the iconic Skrulls can't appear in a Marvel Studios movie, it's because their first appearance took place in the pages of Fantastic Four. And what a debut it was for the shape shifting aliens! After being defeated by the team, Reed Richard hypnotised them into turning into harmless cattle. Or so he thought - years later, it was revealed the tainted milk from the "cows" had given an entire town of people their own shape shifting powers!