Not so long ago Robert Downey Jr confirmed that he would be in both Iron Man 2 and The Avengers. Good news for those of us hoping that The Avengers, would feature the actors crossing over from individual films.

Downey Jr has been talking about The Avengers, and the main problem it could face.

With Robert Downey Jr the only main superhero cast for The Avengers, he seems qualified to talk about what he thinks of the film. He talked to MTV about the pressure of making the ultimate superhero film.

If we don’t get it right it’s really, really going to suck. It has to be the crowning blow of Marvel’s best and brightest because it’s the hardest thing to get right. It’s tough to spin all the plates for one of these characters.

He's not wrong. And I wonder how the Captain America and Thor characters will work, if their individual films are maybe not as well received as Iron Man and The Incredible Hulk. Downey Jr is also worried that the semi realistic setting of Iron Man, won't work quite so well when it's part of an Avengers film.

I think its important that I do what I’m supposed to do which is keep my side of the street clean. The danger you run with colliding all these worlds is [director] Jon [Favreau] was very certain that ‘Iron Man’ should be set in a very realistic world. Nothing that happened in ‘Iron Man’ is really outside the realm of possibility. Once you start talking about Valhalla and supersized super soldiers and jolly green giants it warrants much further discussion.

I have only read The Ultimates so I don't know how accurate that statement is. But I reckon that explaining The Incredible Hulk and Captain America, takes a bit more suspension of disbelief than Iron Man. I wonder what storyline will be able to bring all these characters together. Should they be trying for a realistic storyline? Or is that not what you want from The Avengers?