User blog comment:Mark4518/X-Men’ Producer Would Love An ‘Avengers’ Movie Crossover/@comment-5364175-20130220191202

As ProfessorKilroy said in one of the responses to the first comment, Just do what Stan Lee did in the 60's! Don't do a huge crossover, just make mentions to the characters in eachother's movies.

I agree with that. For example, there was an issue of Tales of Suspense in the 60's where Iron Man fought the Angel. But, don't even do that! Just mention the characters.

Kinda like in the Ultimate Universe, where you know that the other characters exist, but it's not one big crossover.

For example, in an Amazing Spider-Man movie, anti-mutant protesters could throw stuff at him, or Jameson could call him a "masked mutant menace".

And, in a movie outside the MCU, there has to be at least some mention of the Avengers' battle in Manhattan and what the other characters were doing during it, or at least show Manhattan being rebuilt. And, if there is going to be this shared universe, characters can't say things like "that's impossible!" without even mentioning that superheroes are common now.