At least two Ice Ages marked the history of the planet Earth.

First Ice Age Edit

The First Ice Age occurred in the time of Neanderthals. (TV: Ghost Light; AUDIO: The Exxilons) During this time, an Ice Warrior craft from Mars crashed and buried itself. (TV: The Ice Warriors) One Neanderthal was preserved by Light. (TV: Ghost Light) The Dæmons visited Earth, and according to the Third Doctor, inspired cave paintings of powerful supernatural beings. They favoured humans over Neanderthals, causing the latter to die out. (TV: The Dæmons)

The First Doctor visited Earth during the Ice Age, where he encountered a monster. (COMIC: The Ice-Age Monster)

In Birmingham during the Ice Age, the Eleventh Doctor and Amy Pond saved a group of Neanderthals who were being experimented upon by aliens. (COMIC: Snow Globe)

When Amy made a smart remark about the Doctor's suit, he warned her that the Ice Age was "a click away on the dial". (GAME: City of the Daleks)

When Majenta Pryce tried to activate the SKARDIS, it released a chronal wave which froze Sydney in ice from the Ice Age. (COMIC: The Age of Ice)

When Danny Pink asked how a tree could naturally grow in one night, the Twelfth Doctor claimed that a similar question was asked about the Ice Age: (TV: In the Forest of the Night)

How can whole glaciers just pop up out of nowhere? Well, they just did. That's how this planet grows - a series of catastrophes. Farewell to the Ice Age. Welcome to the Tree Age. Possibly. When the Ice Age was here, you lot managed to cook mammoth. Now there's a forest, you'll just have to eat nuts.The Twelfth Doctor [src]

Second Ice AgeEdit

Earth suffered a Second Ice Age circa the year 5000, a time period visited by the Doctor during one of his four incarnations (TV: The Talons of Weng-Chiang) and, later in his life, during his fifth (AUDIO: The Butcher of Brisbane) and eighth incarnations. (PROSE: Emotional Chemistry) The Second Doctor met the thawed Ice Warriors during this time. (TV: The Ice Warriors)

Behind the scenes Edit

Publicity material for The Ice Warriors sets that story in the year 3000, but no other stories occurring around that era mention an Ice Age. In the televised story, it is described as the "second Ice Age" whereas in the novelisation it is called the "New Ice Age". The Fourth Doctor mentions an Ice Age in 5000 in Talons, but in that story's novelisation there is no mention of an Ice Age. In the comic story The Keep, Earth is ravaged by solar flares in the 51st century instead of an Ice Age.

It is worth noting that during the Ice Age, only part of the planet was covered, not the entire world, so there is some room for discrepancies.

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