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Amity Parkers in Gotham
Casper High students graduated. As much as they loved their town (which now included ghosts as recurring residents) they knew they had to go. Not because Phantom didn't do a good job, or that ghosts attacked daily (on the contrary, after Phantom's intervention the destruction became concentrated in the Infinite Realms), but they had to go to a university. That's why most of them applied to Gotham University, it seemed right.
Sure, Gotham wasn't as cool as Amity, nor did it include dimension travel to the Realm of the Dead (Amity Parkers had access to the Infinite Realms as long as they abided by Walker's rules), but they had a great scholarship program, and the city was so chaotic because of its heroes and villains that it felt...like home.
The problem was that no one taught Casper's ex-students some basics: Feeling afraid, avoiding your attackers, not attacking back. Things that seemed like common sense did not go through their heads. After years of dealing with ghost attacks they had gotten used to it, and knew how to counterattack.
So, after their arrival they were knocking out rogues, stopping robbery, and looking bored at the prospect of dying. That made Batman suspicious of a secret society of young soldiers, although it didn't really make much sense, was someone training teenagers? The batfamily was worried at the prospect.
At some point, there was even an "undead" attack in what was called the Justice League; Of course, the Amity Parkers were the first to establish a secure site and prevent the invasion from advancing. At the end everything seemed lost and the undead epidemic was about to spread out of Gotham, but Dash snorted and said that he would "contact a friend that can help", which raised the suspicions of the League.
Danny, who was taking a year off before starting his university studies, raised an eyebrow at the group he had with his old classmates. He shrugged before transforming into Phantom and going to the place, in a few minutes the invasion was over and Bruce was 90% sure that there was a secret society training a teenage army.