Earth/Other realities

Alternate counterparts of Earth existed in other realities. These locations shared similarities with Earth from the Doctor's universe, despite existing in parallel universes or alternate timelines.

The Year That Never Was
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Silurian Earth
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Genocide
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Cyber-President's timeline
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Sea Devil Earth
Created by a temporal paradox that occurred in 1969 due to an encounter between the Tenth and Thirteenth Doctors, (COMIC: A Little Help from My Friends) the Sea Devil Earth came about when the Skithra successfully kidnapped Nikola Tesla and Thomas Edison. With their technology repaired, the Skithra awakened the Sea Devils beneath the Raven Peninsula to serve as their army to conquer Earth. This timeline was undone when the Doctors managed to stop the Sea Devils' awakening. (COMIC: Alternating Current)

Earth-33⅓
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Who's Who? (Primitive world)
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Who's Who? (Parallel world)
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Dawn 1027
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Terra Nova
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Unbound Universe
For much of its history, this Earth shared the same timeline as its N-Space counterpart only for their histories to diverge when the Third Doctor was exiled to 1997 instead of the 1970s. Without the Doctor's expertise, UNIT resorted to more destructive means to repel the various extra-normal attacks, leaving Earth a heavily damaged world by the time that the Time Lord finally arrived. (AUDIO: Sympathy for the Devil)

Inferno universe
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E364449
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E341894
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Pete's World
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The Daft Dimension
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River Song's World
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Telepresence
This Earth was conquered by the Cyber-Mainframe. Rather than upgrade its populace, the Cyber-Mainframe instead enslaved the humans as batteries, harvesting their bio-electric energy to fuel their multiversal crusade as well as setting up the necessary Cyber-technology to use this Earth as a base. This Earth was briefly linked to its N-Space counterpart by dimension bridge, (AUDIO: Telepresence, Code Silver) before the War Master managed to sever the connections. (AUDIO: Master of Worlds)

Christine Summerfield's universe
to be added

Federation universe
In the Federation universe, Earth was a member of the United Federation of Planets, an inter-planetary meta-government, by at least the 23rd century. In the 24th century, this Earth was nearly assimilated by the Borg Collective before the crew of the USS Enterprise managed to destroy the invading Borg cube.

In a possible future of this reality, one where the Cybermen had conquered and assimilated the Borg, Earth became the last holdout of resistance against the Cybermen before they conquered it in 2533. (COMIC: Assimilation²)

Orphan 55
In one possible future, global warming, economic collapse, mass migration and nuclear war turned the Earth into an uninhabitable wasteland populated by the Dregs, the mutated remnants of humanity. The Thirteenth Doctor told her companions that Orphan 55 was just one possible future for the Earth and it could be avoided if humanity made the right choices. (TV: Orphan 55)