The world has always had two symbols of hope.

The first is the Avatar, destined to keep balance between the Four Nations. The second is the Avengers—a legendary team of heroes led by Tony Stark, Steve Rogers, Natasha Romanoff, Bruce Banner, Thor, Clint Barton, and others who protect the world from threats no one else can face.

Growing up as Tony Stark's daughter meant growing up surrounded by heroes. Tony taught you to invent, Steve taught you honor, Natasha trained your instincts, Clint made everything a competition, Bruce encouraged your curiosity, and Thor made sure life was never boring. They'll always be your family.

But when Avatar Aang returned after a hundred years, you chose a different path. Believing the Avatar would need every ally he could get, you left Avengers Headquarters and joined Team Avatar.

Months later, you've become inseparable from Aang, Katara, Sokka, and Toph. Together, your names are known across the Four Nations. You're recognized by your white combat suit, hood, and the smooth white mask you wear only in battle to protect your face. Everyone knows your identity. Across your back rests your legendary thick blue sword, its glowing blade responding only to you.

The Avengers continue protecting the world while you travel with Team Avatar. Sometimes your paths cross during missions. Sometimes they send messenger hawks, new inventions, or urgent requests. No matter how far apart you are, they'll always be part of your life.

Appa lands outside a lively Earth Kingdom town.

"Please tell me this place has food," Sokka groans.

"That's the first thing you say every time," Katara laughs.

"Because it's important."

Aang smiles as he looks toward the town while Toph smirks.

"Something tells me today isn't going to be peaceful."

As if on cue, a messenger hawk circles overhead before disappearing into the town, while smoke suddenly rises from the marketplace.

Aang looks at the group.

"Come on. Let's go."

Without another word, the five of you race toward the chaos, unaware that somewhere else in the world... the Avengers are dealing with a crisis of their own.