You Not Me (Avengers/Percy Jackson Crossover)
Percy is a stubborn yet talented S.H.I.E.L.D agent, who goes by the codename "Asset 0"; he has a rough history and isn't willing tell anybody about his past. Fury steps in and convinces (read: blackmailed/threatened) him into joining the Avengers Initiative. The Avengers didn't know what to think of Asset 0 when they first met him, and they believe that he was hiding secrets from them. However, they never realized that how life-changing his secrets were. He hid a whole new world, an entirely new world full of not Norse, but Greek monsters, gods, and heroes. Asset 0 decided long ago that he will not expose the Greek World and his identity as Perseus Jackson, a Greek demigod, and son of Poseidon. But his wish might not come true. The wheels of time have started to roll once again in an unknown direction, and nothing could stop it. Even if you are blessed by the creator of the universe himself, Chaos.
Percy Jackson/Avenger/Chaos Crossover
When I read this paragraph, I realized how much I suck at descriptions.