<Ul> <Li> Constantine </Li> <Li> Supergirl </Li> </Ul> <P> 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 stars Stephen Amell as Oliver Queen / Green Arrow, Grant Gustin as Barry Allen / Flash, Megalyn Echikunwoke as Mari Jiwe McCabe / Vixen, with an ensemble cast leading Legends of Tomorrow, including Arthur Darvill as Rip Hunter, Caity Lotz as Sara Lance / White Canary, Brandon Routh as Ray Palmer / Atom, Dominic Purcell as Mick Rory / Heat Wave, with Victor Garber and Franz Drameh as Martin Stein & Jefferson "Jax" Jackson / Firestorm . Russell Tovey stars as Ray Terrill / The Ray . </P> <P> 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 further in August 2015 with the animated series Vixen on The CW Seed, and again with the live - action team up series Legends of Tomorrow in January 2016 . The franchise has also crossed over with DC Comics television shows which air on other networks; Arrow crossed over with the short - lived NBC series Constantine in the former's fourth season, while there have been multiple crossovers with the Supergirl TV series, primarily following its move from CBS to The CW . </P> <P> Many actors and characters have appeared across each of the series, with Wentworth Miller, John Barrowman and Katie Cassidy signing deals to become series regulars across Arrow, The Flash and Legends of Tomorrow as Leonard Snart / Captain Cold, Malcolm Merlyn / Dark Archer and Laurel Lance / Black Canary / Black Siren, respectively . </P>

Is supergirl in the same universe as flash and arrow
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