Doctor Who universe: Difference between revisions

[[Martha Jones]]'s employment by [[UNIT]] was first mentioned in the ''Torchwood'' episode ''[[Reset (TV story)|Reset]]'', in which she appeared, and ''[[The Sontaran Stratagem]]''/''[[The Poison Sky]]'' had a semi-sequel in the form of the ''The Sarah Jane Adventures'' story ''[[The Last Sontaran]]''. ''[[The Stolen Earth]]''/''[[Journey's End]]'' brought together cast members of three series. A number of more casual mentions have also taken place, such as Sarah Jane suggesting "[[Harry Sullivan|Harry]]" and "[[Alistair Gordon Lethbridge-Stewart|Alistair]]" as possible names for [[Luke Smith|Luke]] in ''[[Invasion of the Bane]]''. Likewise, Sarah's description of the origins of her [[coulrophobia]] in ''[[The Day of the Clown]]'' returns the viewer to the setting of ''[[A Girl's Best Friend]]''. While such "crossovers" can be narratively insignificant, they nevertheless reinforce the notion of a single, shared universe.