The Arrowverse is a shared fictional universe that is centered on television series airing on The CW, based on characters appearing in publications by DC Comics. The first television series was Arrow based on the character Green Arrow, which debuted in October 2012. The universe was expanded with the series The Flash in October 2014, which is based on Barry Allen/Flash.The universe expanded in August 2015 with the animated series Vixen on The CW Seed, and expanded again with the live-action team up series Legends of Tomorrowin January 2016.