Petty crook Harry Milgrim and his cousin, scientist Roger Braintree, plan to use a subsonic device developed by Braintree, which places people in an induced slumber, to rob Central City. Milgrim fakes his death to infiltrate the police station and steal valuable information, pinning the blame on Barry, who races against time to both prove his innocence and prevent Milgrim and Braintree from conducting a citywide robbery. In the end, he triumphs, with Milgrim and Braintree being arrested, clearing his name.

Barry feels betrayed when the city treats James Jesse as a celebrity ahead of his trial. Jesse later escapes from prison with help from an obsessive fan, Zoey Clark, and becomes the Trickster once again, with Clark as his assistant, Prank. They brainwash the Flash into joining them in wreaking havoc, damaging the Flash's public image.