Batman Arkham Knight X Marvel's Spider-Man
After the defeat and subsequent revival of the Inheritors, and their adoption, Peter Parker of Earth-1048 returns to his world with the hopes that he'll no longer be involved in shenanagins of the cross dimensional sort.
This is of course, the exact moment that a portal opens up underneath his feat and dumps him on an alternate earth unlike any he's seen.
Peter is, in his humble opinion, understandably frustrated with his current situation, until he realizes that the city he's in is a cesspool of criminal scum and is just barely holding on thanks to the efforts of it's protector.
This may not be his world, or hell, even his part of the multiverse, but right now Spider-Man has a responsibility to use his great power in the service of others, regardless of what others want.
Batman is not amused by the unknown meta vigilante who'd suddenly appeared via portal and started going to town on the thugs and low lives of his city, but right now he's too busy tracking down Scarecrow to do anything about him.
The moment they cross paths however, is another story all together, and if it comes down to a fight, Batman jas beaten both better men and more horrifying monsters.
The Arkham Knight is left wondering why the hell it is that Gotham is such a hot zone for "Heroes" to cowardly to do what needs to be done. Though kudos to Bruce for deciding to leave the new Meta alone in order to focus on Scarecrows fear toxin, didn't think the bastard had it in him.