Doomsday (in-universe)
From Tardis Wiki, the free Doctor Who reference
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In a parallel universe, Doomsday was an episode of the television series Doctor Who.
The episode depicted a fictional version of the Battle of Canary Wharf that took place in the Doctor's universe. When a Cyberman from the actual battle slipped into this parallel universe after the fact, Ally recognised the Cyberman as being from the episode. (COMIC: The Girl Who Loved Doctor Who)