Fisher is set to star in the CW show as Bart Allen who many might know as Impulse, the fastest teenager on the planet.
Fisher will step foot into the Arrowverse as a guest star. Bart Allen is the future son of Barry Allen and Iris West-Allen. Bart has a penchant for wildly impulsive behavior so Barry and Iris will definitely have their hands full trying to teach him patience. Barry and Iris may have their work cut out for them to wrangle Bart, but they will have to get it together if they want to stop Team Flash’s biggest threat.