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The university had a gigantic library in mid-space, in which the books would be linked into the readers' minds. When the Tenth Doctor and Rose Tyler visited it, they found that Macrobes had invaded the mindlinks like viruses, going directly into the readers' minds and turning them into zombies. The Doctor defeated the Macrobes, saying they had invaded the digital world for centuries. (COMIC: The Macrobe Menace)