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Hame had once told the Doctor of a prophecy - that the Face would impart one final secret to a traveller without a home. She goes to the senate house and meets the Doctor, Hame and the Face of Boe, whose tank has now shattered. It uses the last of its energy to help the Doctor open up the tunnel, so that the cars can fly up into the now empty city - including the one with Martha on board. It is keeping the Motorway running, but is now dying. The Face of Boe was able to close off the Motorway - trapping everyone down there until the plague had abated.
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It mutated into a virulent plague which wiped out the city.
DR.WHO GRIDLOCK PATCH
Hame explains that a new Mood patch was developed some years ago - called Bliss. Novice Hame arrives in the car containing the Doctor and teleports him to the senate house in the city, where he is reunited with the Face of Boe. This is what is happening to Milo and Cheen's car. They also attack vehicles which use the Fast Lane. Looking down into the dense smog, he sees that the base of the tunnel is infested by giant crab creatures, which he identifies as Macra. He reaches the level above the Fast Lane. He has decided to travel down to the lower traffic levels by dropping down through the intervening cars. He is being looked after by Novice Hame, who had earlier tended him at the hospital of the Sisters of Plenitude. In the city itself, the Face of Boe knows that the Doctor has arrived. Martha, meanwhile, has found herself captive of Milo and Cheen, a friendly young couple hoping to get work outside the city. Brannigan and Valerie are frightened to follow even though the Doctor makes three, as they have heard disquieting rumours about this lane. As it has three people on board, it is allowed to go down to the Fast Lane at the bottom of the tunnel. Brannigan has friends on social media, and the Cassini sisters - really a married couple - identify the car she is travelling in. The Doctor tells them he needs to find the vehicle that Martha is on. Vehicles only manage a few feet per day if they are lucky.
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These kittens were born on the Motorway, and Brannigan explains that the traffic has been in a permanent jam for decades. On board are Thomas Kincade Brannigan, a Cat Person, and his human wife, Valerie, along with their children. The smog is overpowering, but the car nearest him opens and he is invited in. This is a vast tunnel, filled with identical van-like vehicles. He goes through a door and finds himself in the Motorway. The Doctor informs the people in the booths that they will close business immediately - or he will do it for them - before giving chase. They are apologetic, claiming they need a third passenger. Suddenly, a young man and woman appear and abduct Martha at gunpoint, dragging her away.
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The Doctor is puzzled as to why this should cause her such distress. A young woman buys some "Forget", as she is sad that her family have gone away to the Motorway. They contain people selling Moods - drug patches which stimulate emotions. A number of wooden booths spring to life. She asks instead if they can go to see his home planet, but the Doctor shrugs this off. Nor is she impressed with the location of their landing - a rain-swept alleyway. Martha is not impressed that he is taking her to a place where he took Rose. He selects somewhere that he has been to recently - the city of New New York on the planet New Earth, some 30 years after his last visit. Once into the past, and now once into the future. In which the Doctor decides to take Martha on a second trip.