What fictional universe is aired on the CW for The Flash?
Arrowverse 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.
Our Worlds at War "Our Worlds at War" was a comic book storyline, published by DC Comics in mid-2001. OWAW was a crossover storyline that spanned several different books, including several books starring Batman, Superman and Wonder Woman, The Flash, Green Lantern, and a number of supporting characters and books. Creators involved in the crossover included writers Jeph Loeb, Joe Casey, Mark Schultz, Joe Kelly, Phil Jimenez, and Peter David, and artists that included Mike Wieringo, Ed McGuinness, Doug Mahnke, Ron Garney, and Leonard Kirk.