Donna’s helped The Doctor avert disaster in modern-day Britain and taken a trip back in time to the Roman Empire – now she’s ready to experience an alien world. The duo visit the home planet of the Ood, a servile race The Doctor has encountered before (in series two episodes The Impossible Planet/The Satan Pit). A company run by the ruthless Mr Halpen (Tim McInnerny) is exploiting the genial aliens – and it’s up to The Doctor and Donna to discover the secret he’s hiding
Martha left the TARDIS at the end of Last of the Time Lords, whereupon she gave The Doctor a mobile phone with which she promised to contact him. Her fiancéee, Tom Milligan, was also seen in that episode.
Luke Rattigan invented Fountain Six.
UNIT were previously known as the ‘united Nations Intelligence Taskforce’, although it is claimed the name was changed at the request of the UN to ‘Unified Intelligence Taskforce’ after their appearance in Aliens of London/World War Three.
We first discover Martha is working for UNIT in the Torchwood episode Reset. The organisation is later seen in the episode Fragments.
The Tenth Doctor mentions that be once worked for UNIT, most notable in his third incarnation. His comment about not knowing whether it was in the 1970s or 1980s refers to the dating problems associated with various UNIT stories (especially Mawdryn Undead).
