Computer virus

Computer viruses are software programs infecting computers for various usually malicious reasons. The Doctor gave Mickey Smith a computer virus that would erase all evidence of his existence from the Internet. (DW: World War Three). Similary, a Bad Wolf virus had at some point erased all info on Rose Tylor from the Torchwood knowledge base. (DW: Love & Monsters)

Another virus, develloped by Earth cyberterrorists and later used to reprogram Mr Smith, was the Armageddon virus. (SJA: The Lost Boy)

The Movellans were slaves before they were freed by a computer virus