A scene from “Unfinished Business”

(28 March 2016)

This is a crossover episode with the series Supergirl which originally appeared on CBS (currently on the CW network), which made it a rare cross-network event. Grant Gustin guest stars as Barry Allen/The Flash, traveling between parallel Earths and appearing on Supergirl's Earth. Although this is a Supergirl episode, it ties in with the events of Season 2's "Versus Zoom". The quotes below are limited to Barry interacting with Supergirl as the costumed Flash.