THR reported news of the renewal and move, which confirms recent reports that such a network switch was being discussed. The CW --- which is co-owned by CBS and Warner Bros., who produce Supergirl -- already is the home to The Flash, Arrow, and Legends of Tomorrow (all, like Supergirl, executive produced by Greg Berlanti). In a rare cross-network crossover, The Flash recently appeared on Supergirl for a highly rated episode.
For that crossover story, the Flash traversed the multiverse to team up with Supergirl, who exists in a parallel universe - something that will no doubt need to be addressed when we see, presumably, more crossovers between the shows next year, now that they are on the same network.
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