Downey: We need to get 'Avengers' right

Rex Features

Robert Downey Jr. has said that Marvel Comics crossover film The Avengers could run into problems if it is not done correctly.

The actor, who recently signed up to reprise the role of Iron Man (aka Tony Stark) in the 2011 movie, said it will be tough balancing all the story's superheroes.

"If we don't get it right, it's really going to suck," he told MTV.

"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."

Downey Jr. also revealed that he is concerned that the realism of Iron Man may be lost in The Avengers.

"The danger you run with colliding all these worlds is that Jon [Favreau, Iron Man director] was very certain that Iron Man should be set in a very realistic way. Nothing that happened in Iron Man is really outside the realm of possibility," he said.

"Once you start talking about Valhalla and supersized super soldiers and jolly green giants, it warrants much further discussion."