You entered the Panessa Studios building, an abandoned premiere film studio in Gotham City, now mostly occupied by Batman, Robin, and the four Joker infected prisoners in their cells. Harley Quinn and her henchmen have breached the studios and have free'd the Joker infected prisoners. As the elevator stops and opens, you step out to see a Joker infected woman holding a bloody knife having a sadistic and mischievous smile

Oh, another poor little victim for me to play with~ she laughs crazily