|We're all afraid, every man and woman on the planet. We're all standing at the edge of the abyss, paralyzed by fear!||„|
|~ Crane, to his son Jonathan|
Gerald Crane was Bruce Wayne's high school biology teacher, and the innovator of the fear-based techniques used by his son Jonathan, who would later become the villain known as Scarecrow.
Gerald made his entire class discuss what feared them the most. He then quickly harvested the adrenal glands from their fresh corpses, in order to acquire the elevated levels of cortisol their utter panic had created. Gerald then injected himself with his own serum so that he might face his own greatest fear - his failure to save his wife from death from a fire.