Percy Jackson and The Avengers

Percy Jackson and Leo Valdez both deciede to leave Camp Half-Blood at the end of the Giant War. Percy decied to move back in with his mom and be a "stay at home kid". While Leo became emancipated and built his own auto repair shop.

Though both of them still face side affects from the war.
Leo and Percy both have nighmares from Tartarus. (Leo from when he closed the doors and was trapped and Percy from when he jumped after fell into the pit with Annabeth)

Nick Fury has had his eyes on both Percy and Leo since they were both young, (Leo since he was eight and Percy since he was 12)
Now that Fury has decided to look into both of them because a threat is imminent. He gathers the Avengers (including Peter Parker). He tells them to capture Leo and Percy and brign them to Stark tower for interigation.

I do not own Percy Jackson or anything Marvel. Those belong to Uncle Rick and Stan Lee