C-Day or Computer Day was to be the day all the world's computers would be networked together and placed under the control of WOTAN. Initially set for Monday, 16 July 1966, C-Day was cancelled when the WOTAN computer was destroyed after failing to take over London. (TV: The War Machines, PROSE: Who Killed Kennedy)

Torchwood was involved in its cleaning up. (AUDIO: The Law Machines)

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