When Percy is forced in to joining the avengers after a miss adventure he doesn't like it at all. However, he is stuck being a part of their team because of a separate mission he was assigned to do by the Olympian council. Nick Fury has detained a girl more powerful than any hero or villain, and Tartarus needs her power to rise up and destroy the gods. The only way to save his camp, is to join the avengers and somehow get her out of there.
4 parts