In 'The Flash III: Deadly Nightshade', Barry Allen, also known as The Flash, battles his arch-nemesis, the deadly Nightshade, who possesses similar superhuman speed. As Barry juggles his personal life and his secret identity as a crime-fighting superhero, he must overcome his own doubts and fears to save the city from Nightshade's destructive plans.
When the Trickster escapes from police custody, the Flash must stop him from wreaking havoc on the city. As the Flash faces off against his arch-nemesis, he must also deal with personal challenges and uncover the Trickster's master plan.