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Dr. Jonathan Crane, also better known as Scarecrow, is a major antagonist in The Dark Knight Trilogy by Christopher Nolan, serving as the secondary antagonist of Batman Begins and as a minor antagonist in both The Dark Knight and The Dark Knight Rises.
He is the corrupt, sadistic chief administrator at Arkham Asylum, who is secretly working with League of Shadows leader Ra's al Ghul and mob boss Carmine Falcone, who bring shipments of drugs in for Crane to use to create his Fear Toxin, which he later sells as a drug to criminals like The Chechen. He works with the League of Shadows again years later when Bane and Talia al Ghul take over Gotham City, serving as a judge in a kangaroo court for Gotham's wealthy citizens, forcing them to choose between death, exile, or "death by exile".
In the live-action films, he was portrayed by Cillian Murphy.