Giant-Man is a superhero identity primarily associated with Hank Pym, a founding member of the Avengers. He has the ability to grow to enormous sizes, increasing his strength and durability. This transformation is achieved through the use of a special growth serum developed by Pym. In addition to his size-changing abilities, Giant-Man has also been known to use his intellect and scientific expertise to aid his teammates. He often collaborates with other heroes, including Wasp, who is also a key character in the Marvel Comics universe.