Using this to his advantage, the Scarecrow tried breaking the mind of Batman again and again, only to fail. When The Joker took over Arkham Island, Crane was released to cause as much death and chaos as possible. Scarecrow is, on certain occasions, more of a threat to Batman than the Joker. Scarecrow's ongoing reign of terror makes him one of Batman's most recurring and psychologically dangerous foes, if not the most dangerous. Kicked out of the university he taught at for experimenting on human subjects, Crane adopted the identity of the Scarecrow, and armed himself with a specialized fear-inducing gas that makes a person's deepest phobia become a frightening reality. Taunted and bullied in his youth, Jonathan Crane vowed to overcome his fears through the study of psychology and biochemistry on phobias and the nature of fear.
