The Alternate Earth that first appeared in “Somewhere Else” is an alternate universe/timeline created in the episode “Somewhere Else”. This universe was an exact copy of Earth right before the four humans died except there were no copies of the four humans. The prime reality Eleanor, Jason, Chidi, and Tahani were sent there with their memories wiped so it was essentialy a copy of everything except the four humans, but since the prime reality versions had their minds were wiped it was effectively a complete copy to see if people can change when confronted with a near-death experience. A large amount of Season 3 takes place here.
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