The Arrowverse is a shared fictional universe that is centered on television series airing on The CW, developed by Greg Berlanti, Marc Guggenheim, Andrew Kreisberg, Phil Klemmer and Geoff Johns, based on characters appearing in publications by DC Comics. The shared universe, much like the DC Universe in comic books or the cinematic DC Extended Universe, was established by crossing over common plot elements, settings, cast, and characters. The Arrowverse primarily stars Stephen Amell, Grant Gustin, Arthur Darvill, Megalyn Echikunwoke, Katie Cassidy, Wentworth Miller and John Barrowman.