Fan Casting Batman: Arkham - Episode 5: Penitentiary

Following the traces of Sharp's blood, Batman arrives at the Penitentiary.
Investigating the building, Batman finds Poison Ivy's cell, who begs to be released, as the plants were suffering and calling her. Batman ignores it and follows, until he finds Sharp trapped in the control room. After freeing him, Batman takes the security codes, allowing him to disable barriers throughout the Asylum.
At the same time, Harley frees Poison Ivy.
Batman follows Harley Quinn into a large room with an electrified floor, which she uses to try kill him. After failing, she sends her henchmen. Batman faces and defeats them.
The Joker is enraged by Harley Quinn's failings and takes her off the "party list", some sort of celebration he plans to hold later.
Harley tries to attack Batman, but is easily defeated and locked in a cell. Harley slips up and says that the Joker has a secret Titan production facility in the Botanical Gardens.