the Avengers - Not A Normal Assassin

"And there came a day, a day unlike any other, when Earth's mightiest heroes and heroines found themselves united against a common threat. On that day, the Avengers were born--to fight the foes no single superhero could withstand! Through the years, their roster has prospered, changing many times, but their glory has never been denied! Heed the call, then--for now, the Avengers Assemble!"

Kneeling behind a throne, a clothed, armored figure known as the other, bows. "The Tesseract has awakened. It is on a little world. A human world. They would wield its power.'

The other faces a horned shaped shadow. Loki is handed the Chitauri scepter, a long golden handle, fitted with a blue gem encircled with silver blades.

"But our ally knows its workings as they never will. He is ready to lead. And our force, our Chitauri, will follow." Tens of thousands of Chitauri stand ready in a seething mass of neat rows and columns....the ground simply quakes. "The world will be his. The universe yours. And the humans, what can they do but burn?"

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Ever since a child Kaya has been trained to be an Assassin since she could walk. Her parents were secret agents and so were her grandparents in World War 2. She had always wanted to be like them.

As a child she was different and only her parents knew about her ability to fly. Kaya was the only on
who knew about this since her parents died in an undercover mission. She hides it and only has to use her power when she needs to. Kaya thinks that if everyone knew about her ability she'd be some freak of nature.

Kaya doesn't know where her ability came from and now she has to help find the teseract?

I don't own any superheroes except for Kaya.