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Mark Ruffalo has teased the first details about the story arc for his character Bruce Banner in next year's team-up film The Avengers.

While plot details about Joss Whedon's all-star film are being kept closely under wraps, Ruffalo did reveal that Banner will develop complicated relationships with both Iron Man and the Black Widow over the course of the movie.

"He has an interesting thing with Black Widow actually," Ruffalo told MTV News.

Ruffalo explained that because both Banner and Tony Stark are from scientific backgrounds, there will be an immediate link between them.

"There's a real admiration between the two of them that's interesting, and Tony Stark really enjoys the idea of watching this guy turn into the Hulk," he added. "So he's nudging him in an interesting sort of way.

"There's a lot of nice, fun play between the two of them."

Ruffalo recently admitted that he was excited to begin work on The Avengers, which started production earlier this week.

The Shutter Island star is joined by Robert Downey Jr., Chris Hemsworth, Chris Evans, Scarlett Johansson, Samuel L. Jackson and Jeremy Renner in the Marvel Studios film.

The Avengers is due to be released in US and UK cinemas on May 4, 2012.