Who do you think Zoom is?

according to series showrunner Andrew Kreisberg. "As the season progresses, more will be revealed," Kreisberg told EW. "We obviously don’t want to give too much away, because we’ve made his identity a mystery that’s part of the ongoing storyline. We’re really jazzed about the storytelling choices that we’ve made this season. So far, the audience has gone with them, and we hope they’ll continue to do so."