Grant, Wagener and Breyfogle introduce the Ratcatcher, another new foe for the Batman in Detective 585 (April 1988) with inks by Ricardo Villagran.
The Ratcatcher manages to be seriously scary without being terribly imposing himself, simply because of his horde of rodents.
He is holding a number of men captive in cells below the city, tormenting them, and using his rats to kill any who try to escape. But the one who does, even though he dies, is recognized as a prominent judge that has gone missing, setting Batman on his trail.
Batman tracks down the Ratcatcher, but their first confrontation ends with the villain flooding the sewer, attempting to kill Batman.