The Claws of Axos was a serial of Doctor Who that aired in 1971. In Red Nose Day2013, Claudia Winkleman speculated that the surprise Dermot O'Leary wanted to give her was "an original alien duplication unit" which originated from the 1971 story. (TV: The Doctor Appears)
The Confounding Case of the Planetary Prankster • The Pernicious Plots of the Big Game Hunter • The Dangerous Dilemma of the Dream Doorway • Assassin on the Railroads • The Curious Case of the Weirdling Woods
Some categorisation may be based upon conjecture. Real world information should not enter into this. Additionally, a character's role in the DWU can differ from the real world - their placement here is for categorisation.