I could be mistaken, but I thought Fliedermaus was an enemy of the All-Star Squadron.
I had to Google this, but, yes, there was such a guy. It's just German for 'bat'.
Strauss' weird 1874 operetta is about a guy who, er, goes to a party when he is supposed to go to jail. Don't ask. The party is hosted by a guy who wants revenge for the time the protagonist tricked him into walking across town dressed in a bat costume, but there's no mention of any crimefighting in it. Not to be confused with Dudley Moore's spoof operetta "Die Flabbergast".