New York's Heroes (A Percy Jackson/Avengers Crossover)

First, it was aliens.

Then it was Titans.

And just this last summer, it was Romans.

Poor, poor New York. A apocalypse about everyday, along with hidden heroes and plotting enemies roaming the busy streets and taking the subway.

And now, two forces of heroes are going to meet, destroying a couple buildings, causing explosions, possibly harming innocents....

(Disclaimer for the whole story: PJO/HoO= Rick Riordan, Marvel=Stan Lee/any other character creator in the Marvel universe)