The Flash (1990)

S1E16 Deadly Nightshade

A new vigilante has emerged in the city, known as the Deadly Nightshade, who takes justice into her own hands by eliminating criminals. In response to this lethal approach, The Flash joins forces with the original Nightshade to stop her before her actions spiral out of control. Together, they must navigate the complexities of her methods and find a way to bring her to justice without compromising their own principles.