In June 1918, Derbyshire and her colleague Gerald Kneale investigated alleged hauntings (actually time shifts from ninety years in the future) at St Teilo's Hospital in Cardiff. They escorted Tommy Brockless out of his ward to ensure his cryogenic freezing and returned the "future" Tommy to his native time to ensure history would take its proper course. (TV: To the Last Man) She worked alongside Jack Harkness. She asked and received a favour from a British Army officer; she wanted to borrow a tank and travelled to 2008 to use it. (COMIC: Rift War!)