Nuclear war

A nuclear war was a war in which nuclear weapons were used. On the worlds on which they were fought, they usually resulted in making the planet mostly or completely uninhabitable.

Nuclear wars on Earth
The First Doctor warned Steven Taylor that even saving the life of a child in the 1240 siege of Kiev could change history into a future where Adolf Hitler did not lose the Second World War and an atomic war consumed most of Asia. (PROSE: Bunker Soldiers)

During the second half of the 20th century and into the 21st century, fear of a third world war was usually connected to the potential for civilisation-destroying nuclear war. (AUDIO: Protect and Survive)

The Vault in Utah was designed to function as a bunker in the event of nuclear war. (TV: Dalek)

In one possible future, nuclear war was amongst the catastrophes that turned the Earth into Orphan 55. (TV: Orphan 55)

Nuclear wars on other worlds
On Skaro, the neutronic war between the Dals and the Thals resulted in massive deaths and mutations which eventually led to the creation of the Daleks. (TV: The Daleks)

The Kraals fought many savage atomic wars which devastated their home world Oseidon and reduced their race to a mere handful. (PROSE: Doctor Who and the Android Invasion)

The planet Minyos was rendered uninhabitable by nuclear war, which had been indirectly caused by the Time Lords. (TV: Underworld)

Atrios and Zeos were engaged in nuclear war for five years. (TV: The Armageddon Factor)

The planet Argolis was made uninhabitable and the Argolins made sterile after a twenty-minute nuclear war with the Foamasi. (TV: The Leisure Hive)

The Earth colony on Eldair became divided into two superpowers that annihilated each other in a nuclear war. (PROSE: House)

The Panjistri told the Kirithons that the original inhabitants of Kirith had destroyed themselves in a nuclear war, leaving only their ruins behind; this, like everything else the Panjistri told them, was a lie. (PROSE: Timewyrm: Apocalypse)

The civilisation of one planet destroyed itself in a nuclear war after a group of Eternals posed as gods and gave them knowledge of atomic power. (COMIC: Uninvited Guest)

Emmeron was embroiled in a nuclear war by the time that the Second Great Dalek Occupation began. It was reduced to a Stone Age level by the Alliance Daleks. (AUDIO: Dalek War: Chapter One)