18 May

18 May was a date.

Holidays and observances
18 May was International Museum Day, which offered a way for time travellers to find lost property or new places to visit and, sometimes, to keep score. (PROSE: Time Traveller's Diary)

Events
In 1538, the Eighth Doctor left England in the company of Lady Risolva, after investigating the Doomsday Chronometer. (AUDIO: The Eighth Piece, The Doomsday Chronometer)

Ed Hill planned to destroy the Earth on 18 May 1969. He was shot and killed by Fitz Kreiner and the Eighth Doctor before he could succeed. (PROSE: Revolution Man)

In 2009, upon which the date fell on a Monday, at 3:00pm UK time, a Triple Conjunction involving Jupiter and Neptune occurred. The Mandragora Helix intended to use its power to conquer the Earth, but was stopped by the Tenth Doctor, Donna Noble, Wilfred Mott, and Netty Goodheart in the early hours of the morning before it could. (PROSE: Beautiful Chaos)

Births and deaths
In 2009, Callum Fitzhaugh was shot by Caitlin, who subsequently died while using the Doctor's sonic screwdriver to overload the Mandragora Helix's computer systems. (PROSE: Beautiful Chaos)