Arkham Asylum's patients include a villain.
Arkham 's high-profile patients are often from Batman 's rogues gallery , such as the Joker , Two-Face , Poison Ivy , the Riddler , Harley Quinn , Clayface , Mad Hatter , Killer Croc , Mr. Freeze , and Scarecrow.
Clayface is an alias used by several fictional supervillains appearing in American comic books published by DC Comics.
Harley Quinn -LRB- Harleen Frances Quinzel -RRB- is a fictional supervillain appearing in American comic books published by DC Comics.
