Earth-38

"Tachyon device tracked you on Earth Thirty-Eight when you met her, so you should find her there."

- Cisco Ramon

Earth Thirty-Eight is one of the many universes in the multiverse, and is the home universe of Supergirl.

History
This Earth is one where the existence of alien life has been common knowledge for over a decade - in particular, the Kryptonian heroes Superman and Supergirl. Barry Allen accidentally traveled to this Earth while testing out his Tachyon device and was able to return home with Supergirl's aid.

A few months later, Barry and Cisco traveled to this Earth to recruit Supergirl's help in facing the Dominators.

When Cisco and Gypsy had a duel over the life of H.R. Wells, they crossed the dimensions and landed on this Earth, in the office of Jimmy Olsen. They were seen by Eve Teschmacher fighting before vanishing into another breach.

Formerly

 * Barry Allen/The Flash
 * Cisco Ramon/Vibe

Formerly

 * Gypsy

Known locations

 * United States of America
 * Central City
 * Gotham
 * Metropolis
 * Midvale
 * National City
 * CatCo Worldwide Media
 * D.E.O. headquarters
 * Alex Danvers' apartment
 * Kara Danvers' apartment
 * Opal City
 * Kasnia
 * Corto Maltese

Supergirl
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Season 2
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Trivia

 * The number 38 is a reference to 1938, the year Superman debuted.
 * Barry Allen went through a series of names from individuals on his Earth and Earth Two, seeing if they exist on Earth Thirty-Eight. After running them by Kara Danvers and looking them up online, it appears that Harrison Wells, Cisco Ramon, Caitlin Snow, Green Arrow, Black Canary, The Atom, Firestorm, and Zoom all either do not exist or at the very least don't share the same names and identities of their doppelgängers.
 * Earth Thirty-Eight is a case that is very different from Earth One, lacking many of the same things, such as S.T.A.R. Labs. Also, Barry Allen/The Flash, Harrison Wells, The Atom, Cisco Ramon, Zoom, Caitlin Snow, Green Arrow, Black Canary, FIRESTORM, and many other people from Earth One don't exist on Earth Thirty-Eight, being a major difference from Earth One.