The Flash — “Duet” — FLA317a_0178b.jpg — Pictured (L-R): Carlos Valdes as Cisco Ramon, Grant Gustin as Barry Allen, Candice Patton as Iris West, Tom Cavanagh as Harrison Wells, Chris Wood as Mike, Melissa Benoist as Kara/Supergirl, Danielle Panabaker as Caitlin Snow, and David Harewood as Hank Henshaw — Photo: Katie Yu/The CW — © 2017 The CW Network, LLC. All rights reserved.

The CW Teases The Upcoming Flash / Supergirl Musical Crossover