Earth

"That's what you've all proven here. Meta-humans or not, superpowers or not, you are Earth's mightiest heroes."

- Kara Danvers

Earth is the third planet orbiting the solar system's yellow sun. The planet serves primarily as home to its native race, the human, and came into existence long before the written history of its population. A version of Earth exists in each universe within the multiverse.

History
In prehistoric times, the Earth was populated by dinosaurs.

Earth-1
In the 20th century, some humans began to gain superpowers through various means. They become known as meta-humans, and the threat posed by their abilities attracted the attention of an alien species known as the Dominators. In 1951, the Dominators launched a reconnaissance mission in Redmond, a city in the United States, and waged a battle against the United States Army. The aliens would later return in 2016 with the goal of eradicating all meta-humans after they deemed Barry Allen's ability to travel through time a threat to all of reality. However, they were defeated and forced to retreat by the Earth's heroes with help from Supergirl an alien herself from another universe.

A year later the Earth was attacked again this time being Nazis who originated from Earth- X: A world where the Nazis won WWII instead of the Allies. Howver fortunately earths heroes received assistance from the resistance of Earth-X and managed to defeat the invasion.

In late 2018 the Earth was tested by the god like being known only as The Monitor who wanted to prepare Earth and it’s heroes for a threat that put the entire Multiverse at risk. Putting the reality rewriting Book Of Destiny in the hands of maddened Arkham Asylum Doctor John Deegan who used the book to rewrite reality in his own twisted image. However he was stopped by The Flash, Green Arrow, Supergirl and their allies.

Arrow
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Season 7
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The Flash (The CW)
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Season 5
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Vixen
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Season 2
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Supergirl
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Season 4
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DC's Legends of Tomorrow
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Season 4
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Trivia

 * Ray Palmer is the only known human to have spent an extensive period of time living in Earth's prehistoric era.