The Incredible Mundo
I think it would be awesome to hook Dr. Mundo up with a green skin and tight purple jeans and a tattered white shirt to make him look like the largest member of the Avengers, "You wouldn't like him when he's angry!" Not only are they both Doctors, but Bruce Banner's alter ego bears a striking resemblance to Mundo and it just makes sense. Plus with so many super hero films coming out it makes sense to give him the super hero treatment. You could pair this with an Iron Man or Dr. Doom version of Viktor.