The Flash: Jordan Fisher Teases Which Arrowverse Shows He'd Like Bart to Crossover With This week's episode of The Flash, "Heart of the Matter, Part 1", saw the Arrowverse's world of speedster heroes get a bit larger with the full introduction of Bart Allen/Impulse, the son of Barry Allen/The Flash (Grant Gustin) and Iris West-Allen (Candice Patton) from the future. Bart and his sister, Nora/XS (Jessica Parker Kennedy) showed up in the present to help Team Flash deal with the intensifying Godspeed War. While there is still one more episode of Season 7 to go so what's next for Bart is still a mystery for fans, the actor bringing Impulse to life already knows what Arrowverse shows he'd love to see the speedster cross over with.