Originally published on http://www.darkhorizons.com/news/33823/-flash-producers-on-supergirl-easter-eggs Following a flurry of rumors last week, "Arrow" and "The Flash" producer Greg Berlanti has confirmed that a "Supergirl" TV series is in development, but it's still in the earliest stages and not as far along as others have suggested. He tells CBR: "We're just starting to work on it.