The Flash 3x17 Sneak Peek #2 “Duet“ (HD) Season 3 Episode 17 Sneak Peek #2 - Musical Crossover

The Flash 3x17 “Duet“ Season 3 Episode 17 Sneak Peek #2 - DARREN CRISS (“GLEE”) GUEST STARS AS THE MUSIC MEISTER IN THE FLASH AND SUPERGIRL MUS...