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The Doctor's encounter with Torchwood in "Army of Ghosts"/"Doomsday" had shown him that Torchwood was an arrogant, racist, greedy, irresponsible & dangerously stupid outfit. By its negligence, Torchwood had helped the Cybus Cybermen from the "Pete's World" parallel universe to invade this universe's Earth, had let loose the Cult of Skaro & a vast number of imprisoned Daleks &, in the end, had cost him Rose.