The producer of "X-Men: Days Of Future Past" hints that a crossover with Marvel's "Avengers" is not entirely out of the question. But before that, the X-Men films are cooking up their own storm.

While they may be fierce competitors, the superhero movie creators acknowledge that the triumph of one film is good for the genre in general. Actors who would usually shy away from seemingly juvenile projects have now taken part. Robert Redford and Sir Ben Kingsley have seen the possibilities and more actors are taking suit.

"X-Men: Days of Future Past" is probably the biggest in terms of casting and if it works, the infusion of more characters will be a strategy that even other studios will employ.

Producer Hutch Parker would like to take it one step at a time. In an interview with Collider:

"I think you have to plan each film as a standalone and commit yourself to that as your primary objective. We've got a bunch of them over the summer-movies that no doubt had plans for the sequel and believed they could be franchises and then the results don't pan out. At the risk of being too bold, we definitely feel like we're on to something and that this is going to be a very special film. And there are other chapters to be told from the platform that this one will give the franchise."

Of course, it is understood that it's a long term vision and there is already a sequel announced: "It's certainly safe to say there will be another X-Men movie, but where the collective audience wants that next journey to take us, is something I hope- We'll make plans and sketch ideas but it's dependent on how everybody reacts and feels when they see the movie. And with the success of these movies in general the bar is being moved a lot. What will come out of the next installment of Batman or Avengers or Iron Man will also inform some of where are the new thresholds, where are the new boundaries we should strive for. It's an exciting time for movies. And a lot of what Bryan has set to do is trying to take the franchise and more importantly the audience to places beyond where they've been before."

Finally, does he see an X-Men/Avengers crossover down the line: "It comes down to when it's in their interest, when it's in their mutual interest they'll figure it out. At the moment, I think they don't see the need. The franchises are successful enough and self-perpetuating enough that I don't think they see the need. But I think they're going to see in what Warners is doing in kind of cross pollinating and what has been done with Iron Man and Avengers, and to some degree what's happened when we've married these two casts - I think the studios and the audience is going to see there's a tremendous opportunity there and may open up that dialogue. Obviously both parties have to be open and that's sort of a question mark."

That would be an unprecedented movie event. It would be difficult but not impossible.

"X-Men: Days Of Future Past" opens on May 23, 2014.