98 - Batman: The Animated Series

It was Ben and Zane's hardest case yet, a real Riddler of a mystery. They would need some help from the local photographer, Devan, to get to the bottom of it. And it paid off - she had taken a treasure trove of pictures and video, exhaustively researching the very same case. She found that there was one common factor behind the string of disappearances of villains in the city: massive amounts of guano left behind at the scene. But what could be doing this? Who would drain the blood of dozens of hard-working megalomaniacal job-creators, yet be smart enough to evade capture. But in a vast city of people throatily declaring "I am Batman," where could they find the elusive Man-Bat?