Which villain uses the Fear Toxin in the Arkham series?

The villain who uses the Fear Toxin in the Arkham series is Scarecrow. His civilian identity is Jonathan Crane, a former psychology professor whose experiments focus on fear and its effects on the mind.

Scarecrow’s toxin causes vivid hallucinations and forces victims to confront their deepest fears. In Batman: Arkham Asylum, he exposes Batman to the toxin during several surreal sequences and plans to contaminate Gotham’s water supply. In Batman: Arkham Knight, he develops a new strain that helps drive a citywide evacuation.

The series portrays Scarecrow’s weapon as more than ordinary poison. It is a psychological chemical weapon that disrupts perception, making Batman’s fears appear physically real to the player. The games use these hallucination scenes to blur the boundary between reality and nightmare.

Players sometimes confuse Scarecrow with Joker because Joker’s blood and Titan formula create major threats across the series. Poison Ivy uses plant-based toxins, while Hugo Strange relies on psychological manipulation and military control rather than fear toxin.