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
Created when Rassilon gave the Cyberiad all the resources of the Time Lords, in the pre-history of the Cyber-Earth, the Cybermen upgraded the Silurians, turning the Silurian Arks into Cyber-Arks that would seed developing plants with cyber-technology.

In the year 2006, the Cybermen returned to Earth, using a new techno-virus. With this new weapon, the Cybermen managed to conquer Earth within three days, turning the population into Cyber-Warriors. After he was infected, the Ninth Doctor attempted to rupture the Eye of Harmony in his TARDIS to destroy the planet only for his ship to fall victim to Rassilon's manipulations of Gallifrey's Eye of Harmony, depriving it off all power. This timeline was undone when the Twelfth Doctor and a remorseful Rassilon joined forces to undo the Cyberiad's perversions of history. (COMIC: Supremacy of the Cybermen)

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
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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)

Jackie Reeve's universe
This was the first parallel universe that Rose Tyler visited as she tried to return to N-Space from Pete's World. During her visit, the Sun went out, destroyed by the reality bomb. Rose returned to Pete's World as this Earth began to freeze over, bringing with her the native version of Clive Finch. (AUDIO: The Endless Night)

Rob Tyler's universe
In this reality, the orbit of the Earth had been altered, bringing it closer to the Sun. This resulted in a severe case of global warming, causing a rainfall to last decades. Rob Tyler, Rose's counterpart, suspected that this situation had been engineered by alien powers who sought to colonise Earth. (AUDIO: The Flood)

SoulTech's universe
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The Last Party on Earth
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Saltwater incidents' universe
In this reality, an automated mining ship parked itself in the solar system and began teleporting the salt out of the Earth's oceans. The people of this Earth managed to stop the process when they communicated to the ship that life existed on the planet. Clive Finch suspected that the ship had not been sent to Earth but, due to the vanishing stars, had gotten lost. (AUDIO: Saltwater)

Humoral Assessment's universe
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Rogue planet's universe
This Earth was passed close to by a rogue planet, one twelve times the size of Jupiter. Only a few hundred thousand managed to survived, as they headed down bunkers developed by Professor Clive Finch, who'd anticipated such an event could happen, after the prophecy of the three comets, though the planet arrived a full year earlier than Professor Finch expected. (AUDIO: The Rogue Planet)

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 of 2020 and it could be avoided if humanity made the right choices. (TV: Orphan 55)