I’ve known since before we started this season. It’s been the thing that I’ve been most excited about all season, which sounds ridiculous because it’s really a season 5 thing. I’ve spent all of season 4 being excited about this thing that we’re going to do in season 5! It’ll be one of the cooler reveals that we’ve done in a couple seasons.

I never wanted it to be a thing where Iris became a superhero [permanently] on The Flash because A) we’ve got enough superheroes, and B) that’s just not who Iris is. I think the most important thing about Iris as a character is she’s a hero in her own right without any superpowers. She uses her heart and her intellect and her street smarts to help the team. It appeals to the audience that we ourselves, as human beings every day, can be heroes in our own lives. We don’t need superpowers, we don’t need to get struck by lightning tomorrow, to do something important. I think Iris illuminates that on the show.