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The Brigadier used it to get the Fourth Doctor to assist in investigating destroyed oil rigs. (TV: Revenge of the Cybermen, Terror of the Zygons) The Brigadier used it again to bring the Doctor back for a training exercise, resulting in an argument between the two men. (PROSE: Hello Goodbye)
The space-time telegraph eventually came to be stored in the UNIT Black Archive. When several Zygons infiltrated UNIT and Kate Lethbridge-Stewart activated the Black Archive's self destruct, the Eleventh Doctor, along with the Tenth and War Doctors, contacted her via the telegraph to try to stop her sacrificing London to save the world. Despite their warning, Kate felt she had no choice and ordered the telegraph shut down. (TV: The Day of the Doctor)