Earth-1

"This Earth is at the center of the multiverse. It's the access point to every other Earth in existence."

- Hunter Zolomon, referring to Earth One

Earth One is a universe parallel to a plethora of others, such as Earth Two. The name was coined by Martin Stein. To Earth Two citizens, Earth One was initially referred to as Earth Two. Also, to Earth Seventeen's citizens, it is known as Terra Prime.

Earth One is particularly important in that it is a central junction in the multiverse, being the middle intersection from which one can travel to any other alternate Earth.

History
After learning of the existence of parallel worlds, Martin Stein coined the world's name, "Earth One", to describe Team Flash's relative position in regards to all of the other worlds. Beginning in the early 21st century, it has become home to numerous groups of extraordinary protectors, such as the vigilante unit Team Arrow, the scarlet speedster known as the Flash and his team of allies who emerged after the explosion of the S.T.A.R. Labs particle accelerator that gave rise and prominence to superpowered meta-humans, and John Constantine's group of mystical allies. Even in other times, similar such heroes operate, such as the secret mid-20th century alliance the Justice Society of America, and the time-travelling Legends, who are associated with the top-secret organization of the Time Bureau.

Events (in chronological order)

 * B.C.
 * Trojan War (1258-1248)
 * Gallic Wars (before 49)
 * A.D.
 * Damien Darhk's assault on Camelot (507)
 * American Revolutionary War (1775-1783)
 * American Civil War (1861-1865)
 * World War I (1914-1918)
 * Battle of the Somme (1916)
 * Spanish Civil War (1936-1939)
 * World War II (1939-1945)
 * Battle of Saint-Lô (1944)
 * Cold War (1947-1991)
 * Vietnam War (1955-1975)
 * Gulf War (1990-1991)
 * Redmond Dominator Invasion (1951)
 * Somali Civil War (1991-present)
 * Battle of Mogadishu (1993)
 * Afghan War (2001-present)
 * Alpha-Omega release (Hong Kong) (2010)
 * The Undertaking (2013)
 * S.T.A.R. Labs particle accelerator explosion (2013)
 * The Siege (2014)
 * Alpha-Omega release (Star City) (2015)
 * Genesis (2016)
 * Dominator invasion (2016)
 * Invasion from Earth-X (2017)
 * Enlightenment (2018)
 * Crisis of 2024 (2024)
 * Crisis of 2024 (2024)

Timeline alterations

 * Flashpoint (briefly; erased due to Barry's restoration of the timeline)
 * Legion of Doom's alternate reality (briefly; erased due to the Legends' intervention)
 * Anachronisms (sudden prominence throughout time as a result of the time storm caused by the Legends)

From Earth Three

 * Jay Garrick/The Flash

From Earth Nineteen

 * Cynthia/Gypsy
 * Josh/Breacher
 * H.R. Wells (became permanent resident, deceased)

From Earth Thirty-Eight

 * Alex Danvers
 * Kara Danvers/Supergirl
 * Mon-El
 * J'onn J'onzz/Martian Manhunter
 * Clark Kent/Superman

From Earth Ninety

 * Barry Allen

From Earth-X

 * "The Ray" (deceased)
 * Tommy Merlyn/Prometheus (deceased)
 * Oliver/Dark Arrow (deceased)
 * Leo Snart
 * Kara/Overgirl (deceased)
 * Laurel Lance/Siren-X

From The Monitor's realm

 * Mar Novu/The Monitor

From unknown Earths

 * "Music Meister"
 * Harrison Sherloque Wells

Known locations

 * Asgard
 * Valhalla
 * Earth
 * Afghanistan
 * Australia
 * Melbourne
 * Perth
 * Sydney
 * China
 * Hong Kong
 * Corto Maltese
 * Cuba
 * Egypt
 * France
 * Paris
 * India
 * Italy
 * Rome
 * Japan
 * Kahndaq
 * Shiruta
 * Kasnia
 * Markovia
 * Markovburg
 * New Zealand
 * Milford Sound
 * Wellington
 * Qurac
 * Russia
 * Chechnya
 * Moscow
 * Somalia
 * Mogadishu
 * South Africa
 * Spain
 * Sudan
 * Tanzania
 * Ukraine
 * United Kingdom
 * England
 * London
 * Merseyside
 * Liverpool
 * Newcastle
 * Northern Ireland
 * Scotland
 * Wales
 * United States of America
 * Blüdhaven
 * California
 * Coast City
 * Georgia
 * Atlanta
 * Gotham City
 * Illinois
 * Chicago
 * Opal City
 * Louisiana
 * New Orleans
 * Michigan
 * Detroit
 * Missouri
 * Central City
 * New York
 * New York City
 * North Dakota
 * Salvation
 * Oregon
 * Redmond
 * Star City
 * Washington, D.C.
 * Vietnam
 * Zambesi
 * M'Changa Province
 * Zambesi Village

Arrow
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The Flash
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Vixen
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Season 2
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DC's Legends of Tomorrow
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Season 4
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Trivia

 * Earth One vibrates at a lower frequency than Earth Two.

Behind the scenes

 * The universe's name is spelled "Earth-1" in the synopses for episodes.