By day, Darcy serves as a police officer, but by night, she transforms into the superhero known as Black Scorpion, dedicated to thrashing wrongdoers. She soon discovers a plot by a villainous scientist with asthma, who intends to poison the city’s air with a dangerous toxin. To thwart his scheme, Darcy must rely on her superhero persona and the help of a small-time crook named Argyle.