Batman: Return to Arkham City Walkthrough - Part 6 - The Cure - YouTube
I have read many discussions with regards to why the cure didn't work. This is the first time I have seen it being addressed in game. The canonical answer is: Batman was
Amazon.com: Batman Arkham City: Armored Edition (Renewed)
Batman: Arkham City Review - Reviewed
Batman Arkham City Manufacture the cure - YouTube
Batman Return to Arkham City Gameplay - Chapter 11 Manufacture the Cure [4K UHD 60fps]
Batman Return To Arkham City: Walkthrough Part 11 - Manufacture the Cure
Batman: Return to Arkham City Walkthrough - Part 6 - The Cure - YouTube
Batman: Arkham City Walkthrough Finding Ra's Al Ghul.
BATMAN: Arkham City - Walkthrough Part 40 - Manufacture the cure