Tina, Is That You?

Synopsis
Barry is having trouble sleeping. Tina tries to use bio-feedback to help him, but it back fires on Tina. She joins a gang, and she's able to hold Flash at bay with her knowledge of his strengths and weaknesses. Barry has got to find a way to save his friend.

Trivia

 * In making their getaway, the Black Rose Gang are reported as driving north on Keystone Drive. This is a nod to Keystone City, the home base of the original Golden Age Flash.
 * This episode was originally intended to air before the preceding one.
 * Despite having a fairly significant role, the actress portraying Harley Lyndon is not credited.
 * It was revealed only in the Flash TV Special that the actress that portrayed her was Bella Pollini.