75,000 years ago
From Multiversal Omnipedia
Events
- Doctor Who, Doctor Who (Expanded Universe): 55,519 BC (over 57,500 years ago). After Urbanka's ozone layer collapses, Monarch leaves the planet for the first time, with about 3 billion Urbankans' memories stored aboard his ship on computer chips. ("Four to Doomsday," A History of the Universe)
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