|Real name||Otis Flannegan|
|Based in||Gotham City|
|Height||5 ft 11 in|
|Appearances||Arkham Asylum (referenced only)|
Arkham City (referenced only)
The Ratcatcher is a criminal with an unnatural ability to control rats.
Otis Flannegan was once employed as an actual ratcatcher until he began to use his natural gift, an affinity with and ability to control rats, to stage a variety of crimes. Eventually, the Ratcatcher's control over his vermin grew to the point he was able to threaten Gotham City with his large army.
The Ratcatcher has been imprisoned many times within Blackgate Prison, but this has not stopped him causing as much damage as he could on the outside. He uses his loyal pets to relay messages and transport materials via the maze of ventilation ducts that wind throughout the prison.