Avengers: Age of Ultron is promising quite a line-up of characters, as it has been revealed that even Stellan Skarsgard will be back as Dr. Erik Selvig, and the actor promises that he'll once again be naked.

Dr. Erik Selvig is a character created for the Marvel Cinematic Universe, an old colleague of Jane Foster's father who first debuted in 2011's Thor. He went onto play an important role in 2012's Marvel's The Avengers, but made the biggest impression when he was asked to run naked in Thor: The Dark World. It sounds like the actor will once again be stripping down to nothing, this time for director Joss Whedon.

"Yeah, I was naked again. They called my agent and said, 'Do you think Stellan will mind being naked?' My agent laughed his head off. Yeah, I almost insist! Sometimes with a contract you get a nudity clause, which is fantastic. It's supposed to protect me from having my genitals exploited, which I doubt anybody would make a dime on."

Other than that small tidbit, the actor could not say much more about the plot, or the circumstances surrounding his second Marvel disrobing:

"First of all, I don't know what I'm allowed to say. But usually they call me in if they need something explained. There's a lot of explanations to do when it comes to that universe.

Stellan Skarsgård is more surprised than anybody that they keep bringing him back. He didn't have much knowledge of the Marvel universe when signing onto Thor back in 2010, and didn't realize that Disney could make so much money off Marvel's stable of superheroes:

"I didn't have much clue about the Marvel universe at that time. What I said to Kevin Feige, the head of Marvel, was, 'All those superheroes? Still in those comic books? Can you make money out of that?' The whole table just froze and looked at me as if I was an idiot. But you sign on for at least five films, I think. Or I did. I'm going to do my fourth. I'm going to be in Avengers: Age of Ultron, a small appearance. It's something really nice. Even if it's owned by Disney now, it's really run by four or five people, and they know exactly what they're doing. I like working with them because if I have a problem with the scene, I have Kevin Feige's number. I can call the head of the studio. You can't do that when you work on a normal Disney film or with Warner Bros or Paramount."

Are you excited to see the return of Dr. Erik Selvig? Were you hoping he'd keep his clothes on this time?