No Arrowverse Doppelgängers

Arrowverse executive producer Andrew Kreisberg has said we likely won't see any doppelgängers on Supergirl. He said showing Earth-38 team Arrow/Flash/Legends or Earth-1 Kara would "open the floodgates of insanity." However, he said they might be willing if they can come up with "a really good story."