of Earths. After Jay Garrick is rescued from Zoom, he reveals that he is from yet another Earth, designated Earth-3. In the season three episode "The New Rogues", the Flash team explore the multiverse in search of a Harrison Wells doppelganger to replace the Earth-2 version. They encounter four others from various Earths, two of which are named Earth-17 and Earth-19, from which their new recruit, Harrison "H.R." Wells, originates. The television series Supergirl exists as another alternate universe separate from the main Arrowverse continuity. This is confirmed in the Supergirl episode "Worlds Finest", when the Flash appears on Supergirl's universe and names heroes from his world (the Green Arrow, the Black Canary, the Atom, Firestorm) that Supergirl does not recognize. In addition, the Flash's allies Dr. Harrison Wells, Caitlin Snow, and Cisco Ramon do not exist in Supergirl's universe, and S.T.A.R. Labs was not founded due to Wells' absence. Barry Allen does note that they do share celebrities, such as singer Mariah Carey and writer Alexandre Dumas, who wrote The Three Musketeers. Supergirl's universe is coined Earth-38 by Cisco Ramon. Subsequent episodes from Legends of Tomorrow, Supergirl and The Flash reveal that both Supergirl and Barry's universes also share the existences of the alien races of Thanagarians and Dominators. The 2017 crossover event "Crisis on Earth-X" - which sees the heroes from all four shows face an invasion from the titular 'Earth-X', as a world where the Nazis won World War II - establishes that there are 52 known alternate Earths, with the titular 'Earth-X' being the fifty-third Earth, described by Harrison "Harry" Wells of Earth-2, that those who are aware of the multiverse as being so dark and horrific that no interdimensional traveler would dare to journey there. Its history is akin to Earth-1, Earth-2, and Earth-38's, except the outcomes of World War II and Adolf Hitler continued his reign worldwide until his death in 1994. Its inhabitants include counterparts of people from these Earths as well, including Oliver Queen's doppelgänger, who is Hitler's successor as Führer and the villainous archer the Dark Arrow. Teen Titans Issue #48 introduces its own multiverse. Each world pays references to various incarnations of the Teen Titans. See also List of DC Multiverse worlds DC Universe Multiverse (Marvel Comics) References DC Comics dimensions DC Comics planets Continuity (fiction) Comics about multiple time paths Comics about parallel universes Fictional universes