History: (Detective Comics #585) - Flannegan was a Gotham City Sanitation Department ratcatcher who somehow learned to train rats to follow his commands. He killed a man in a bar brawl and was given ten years in prison. Following his release he began kidnapping people involved with his trial, including the judge, a warden and a witness. For five years he kept his victims hostage in Gotham’s sewers. He lived there as well, and spent all his time training an army of rats. Judge Hogan escaped the sewer, but was quickly followed by the Ratcatcher. Once the Judge reached the streets he was killed by Ratcatcher’s trained rats. Batman set a fire in the sewers that consumed Ratcatcher's the army of rats, and captured him before he could kill his remaining prisoners.