Scarecrow's fear toxin

The Scarecrow's fear toxin is a fictional chemical weapon featured in comic books published by DC Comics. It is associated with the Batman line of comic titles, and is utilized by the character of Jonathan Crane, aka the Scarecrow. The fear toxin made its first appearance in Batman #189 in February, 1967.

Description
The Scarecrow's fear toxin is a chemical solution developed by former teacher Jonathan Crane. It is a poisonous gas that causes massive hallucinations in those who inhale it. Specifically, it forced the victim to experience and/or re-live their greatest fears. This is Crane's primary weapon in his criminal career as the Scarecrow.

Comics

 * Batman 189
 * Batman 617

Television

 * Batman: Nothing to Fear
 * Gotham: Pax Penguina
 * Gotham: The Fear Reaper

Films

 * Batman Begins