20 Mind-Blowing Facts You Didn't Know About The Avengers

15. They Fought The Justice League

Marvel and DC superheroes have met a handful of times, but undoubtedly one of the best crossovers was JLA/Avengers. The series featured both sets of heroes visiting each other's Earth's and observing the huge differences between them, and while it was packed full of fights fans had always wanted to see, it was when they teamed up that things got good. Where else could you see Superman weild Captain America's shield and Thor's hammer?