Stature

When Cassie Lang's heart condition worsened, her father Scott Lang used Hank Pym's "Pym Particles" as a cure. Exposure to the particles granted Cassie the ability to change size, and when the Young Avengers formed, she became the heroine known as Stature!

Earth's Mightiest
Stature defeated Living Lightning in the opening round, Iron Patriot in the second, and The Vision in the second mini-tournament to move on to the Finals tournament. There, she was eliminated in the first round by Steve Rogers.