Christina (From Out of the Rain)
From Tardis Wiki, the free Doctor Who reference
Christina was a young female Human who lived on Earth and was confronted by the Ghostmaker and Pearl, and just escaped. She was sent put in a mental home because she now had a severe phobia of travelling shows. In 2009, Jack Harkness and Ianto Jones questioned her about the Night Travellers. (TW: From Out of the Rain)