Batman: Arkham - Episode 4: Arkham Mansion

Season 1: Asylum

Batman arrives at the Batcave. Using the computer, he discovers that Dr. Young researched the Venom drug used by Bane. Based on it, she created Titan, a similar but stronger drug. Knowing the risks that drugs can cause in The Joker's hands, Batman leaves for Arkham Mansion to retrieve the notes. Through the sewer, Batman returns to the surface. Batman enters Arkham Mansion and rescues Aaron Cash who is being held hostage. Batman arrives at Dr. Young's office, and discovers that she has already retrieved the notes. Tracing the Doctor's fingerprints, Batman heads to the mansion's library. He finds the notes that were hidden, and burns them. The Joker says that Dr. Young has been kidnapped by Zsasz, who will torture her to discover the formula. Batman is once again drugged by Scarecrow. He relives the murder of his parents. Once again, Batman faces the giant Scarecrow. After the gas wears off, Batman finds Zsasz in Director Sharp's Office. Batman defeats him and saves Dr. Young. Doctor Young tells that The Joker has Venom and the Titan formula. She speaks of a laboratory in the Botanical Gardens, but when she goes to Sharp's safe to get the security codes, she triggers a bomb set up by The Joker. The explosion kills her and renders Batman nearly unconscious. Harley Quinn appears and taunts Batman with Director Sharp who is still being held hostage. Batman defeats more prisoners and once again follows the tracks to find Harley.