Joss Whedon says the Hulk is one tricky SOB

Can Joss Whedon bring us the definitive Hulk movie? Maybe, but the writer and director seems iffy about the idea.

During an appearance at the Glasgow Film Festival, Whedon, who directed 2012's critical and commercial success "The Avengers," was asked about the possibility of making a film about Bruce Banner's ill-tempered alter ego. Whedon's reply was vague. Whedon said a good Hulk film could be done but, "it would be very, very hard. Hulk is a tricky son of a bitch. He's the Claudio of superheroes."

The Hulk has long been a favorite among fans of the Marvel Comics multi-verse, but unlike many Marvel characters, getting his story on screen has proven tricky. Fans were largely disappointed with Ang Lee's 2003 "Hulk," with Eric Bana in the title role, and while 2008's "The Incredible Hulk" got a better reception, many felt Edward Norton as the green guy and director Louis Leterrier didn't quite capture the character. Whedon cast Mark Ruffalo in the role for "The Avengers,"

and the combination felt like a winner. But Whedon seems hesitant about revisiting the Hulk in his own full-length story.

"The problem is it's a very popular character, but it's not a superhero, "Whedon said. "Half of it's a superhero, half of it's a werewolf. And you can't structure it like a superhero movie, you can't light it like a superhero movie. How do you develop that? It would be extremely difficult. The one thing you would have in your favor would be Mark Ruffalo. But right now I don't know if they have plans to do that or not, because he works so well as part of a greater whole, but by himself, it's tough. I don't envy the guys who went before."

Whedon is a lot more certain about the upcoming "The Avengers 2,"

which he's been confirmed to write and direct. While Whedon was short on details, when asked about the return of the superhero's union, he said fans could expect "Death, death and more death. I can't do any bigger, so I'm trying to do better." The film is expected to reach theaters in the summer of 2015.