The Flash 7x17 Heart of the Matter Part 1 - Season 7 Episode 17 Clip - Promo Trailer HD - The Flash 7x17 "Heart of the Matter - Part 1" Season 7 Episode 17 Sneak Peek - XS AND IMPULSE SURPRISE BARRY AND IRIS IN THE 150TH EPISODE OF THE FLASH - Barry (Grant Gustin) and Iris (Candice Patton) greet their future children, XS (guest star Jessica Parker Kennedy) and Bart (guest star Jordan Fisher), only for a shocking secret to threaten their new familial harmony. Meanwhile, the Godspeed war intensifies and threatens to destroy Central City. Eric Dean Seaton directed the episode written by Eric Wallace & Lauren Barnett (717). Original airdate 7/13/2021