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Alternate timeline

From TARDIS Index File, the free Doctor Who reference.

An alternate timeline is a reality which is different from a parallel universe in that historical events have been altered by a time traveller. These alterations are usually prevented from having ever come to pass, although memories of them are usually retained.

Timeline Negated By Featured in
Barbara Wright marries Ptolemy and becomes Queen of Alexandriaalternate BarbaraVD: The Book of Shadows
The Dark Matrix terrorises EnglandSeventh Doctor and AcePDA: Matrix
Adolf Hitler uses the Timewyrm's power to enable Nazi Germany to conquer EarthSeventh Doctor and AceNA: Timewyrm: Exodus
Nancy Grover uses Grold technology to become a goddessThird Doctor and Liz ShawMA: The Eye of the Giant
The Power Elite take over EarthThird DoctorVD: Prisoners of the Sun
Freedom fighters from the 22nd century assassinate Sir Reginald StylesThird Doctor and Jo GrantDW: Day of the Daleks
Theodore Cassells's experiments lead to a global war which devastates EarthThird DoctorTVA: A Stitch in Time
The Doctor dies on Dust and regeneratesEighth Doctor by destroying Gallifrey (EDA: The Ancestor Cell)EDA: Interference - Book One, Interference - Book Two
Sutekh is freed and devastates EarthFourth Doctor and Sarah Jane SmithDW: Pyramids of Mars
Melanicus creates the Millennium WarsFifth Doctor, Sir Justin and ShaydeDWM: The Tides of Time
Silurian EarthDestroyed, not negated, by Seventh DoctorNA: Blood Heat
The Doctor doesn't leave Gallifrey, allowing many alien races to invade EarthSeventh Doctor, Ace and Bernice SummerfieldDWM: Time & Time Again
Pete Tyler doesn't die and Reapers begin consuming humanityPete TylerDW: Father's Day
Donna's Worldalternate Donna NobleDW: Turn Left
Andrea Yates' Worldalternate Andrea YatesSJA: Whatever Happened to Sarah Jane?
The Trickster's EarthEddie and Barbara SmithSJA: The Temptation of Sarah Jane Smith
The Year That Never WasTenth Doctor, Martha Jones and Captain Jack Harkness DW: Last of the Time Lords
Ship erases Sarah Jane Smith, Luke Smith and Clyde LangerAdamSJA: The Mad Woman in the Attic
Humans don't evolve and Earth is a Tractis colony known as ParatractisEighth Doctor, Sam Jones, Jo GrantEDA: Genocide
The Doctor and his companions become exhibits in the Moroks' Space MuseumFirst Doctor, Ian Chesterton, Barbara Wright, VickiDW: The Space Museum
Humans evolve into HaemovoresSeventh Doctor and AceDW: The Curse of Fenric
Daleks undergo the Mutant PhaseDalek EmperorBFA: The Mutant Phase
The Knights of Velyshaa conquer GallifreyFifth Doctor, Sixth Doctor, Seventh Doctor, the TemperonBFA: The Sirens of Time