Arkham Asylum's patients only include Clayface.
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 .
Arkham Asylum's patients
only include
Clayface
the Joker , Two-Face , Poison Ivy , the Riddler , Harley Quinn , Clayface , Mad Hatter , Killer Croc , Mr. Freeze , and Scarecrow