1870

1870 was the year that Charles Dickens died. He left The Mystery of Edwin Drood unfinished. (TV: The Unquiet Dead)

The Jameson boys encountered Zygons on Tulloch Moor. Donald disappeared, and the older brother, Robert, was found two days later, driven insane. He never spoke again. (TV: Terror of the Zygons)

The Eleventh Doctor, Amy Pond and Rory Williams encountered Kahler-Jex and Kahler-Tek in Mercy, Nevada. To avoid Tek chasing him across the universe for his war crimes, Jex killed himself. Tek became the protector of Mercy. (TV: A Town Called Mercy)