The Greek gods don't realize how hard a demigods life truly is so Chaos (creator of the universe) decides to show them what demigods go through. Especially one demigod in particular who apparently doesn't exist.
She has no name. A name that isn't spoken often. She fights for what she believes in and doesn't care what others think. She can never be figured out. Her personality is too complex for that. Her life has been one battle after the next yet she still goes on. She is the myth that people talk about and when they ask for her name... well she tells them she's The Protector. Their protector.
What if her name becomes so strong and powerful that it reaches the ears of none other but the organization S.H.I.E.L.D. How does Thor know about her? And why foes he hold the name Protector to such high regard?