Earth-1

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 is referred to as Earth Two.

Earth One is particularly important in that it is central in the Multiverse, being the middle point in which you 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.

Arrow
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Season 4
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The Flash
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 * {{Ep|Pilot|page=Pilot (The Flash)}}
 * {{Ep|Fastest Man Alive}}
 * {{Ep|Things You Can't Outrun}}
 * {{Ep|Going Rogue}}
 * {{Ep|Plastique}}
 * {{Ep|The Flash Is Born}}
 * {{Ep|Power Outage}}
 * {{Ep|Flash vs. Arrow}}
 * {{Ep|The Man in the Yellow Suit}}
 * {{Ep|Revenge of the Rogues}}
 * {{Ep|The Sound and the Fury}}
 * {{Ep|Crazy for You}}
 * {{Ep|The Nuclear Man}}
 * {{Ep|Fallout}}
 * {{Ep|Out of Time}}
 * {{Ep|Rogue Time}}
 * {{Ep|Tricksters}}
 * {{Ep|All Star Team Up}}
 * {{Ep|Who is Harrison Wells?}}
 * {{Ep|The Trap}}
 * {{Ep|Grodd Lives}}
 * {{Ep|Rogue Air}}
 * {{Ep|Fast Enough}}

Season 2

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DC's Legends of Tomorrow
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Season 1
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Constantine
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Season 1
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Arrow: The Dark Archer

 * "Sacrifice"
 * "Carnage"
 * "Deception"
 * "Confession"
 * "Tempest"
 * "Blessed"
 * "Traitor"
 * "Betrayal"
 * "Sacrifice"
 * "Vengeance"

Behind the scenes

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