Teen daredevil Miguel and runaway Summer travel to the home of the Flash in Central City to steal back the H-Dial as a secret former wielder of the powerful device swears to do anything to become a hero again-including handing the dial to Mr. Thunderbolt, the villainous entity working to steal the Dial. But it's hard to work together when you can't trust your partners...so it's time for the mysterious Summer to reveal her past to Miguel!