1935

In January 1935, the Doctor met Mao Tse-Tung during the Long March. (TV: The Mind of Evil)

On 10 March, Death in the Clouds, a mystery novel by Agatha Christie, was first published. Although she had forgotten the events of her adventure with the Tenth Doctor and Donna Noble in 1926, a subconscious memory of those events inspired her to write this book, which was destined to remain in print to the year 5,000,000,000. A facsimile edition of Death in the Clouds published in this year was obtained by the Doctor. (TV: The Unicorn and the Wasp)

Edward Travers uncovered the Great Intelligence and robot Yetis in Tibet. (TV: The Abominable Snowmen, The Web of Fear)