End of time
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The end of time was used synonymously with the end of the universe. (TV: Listen [+]Loading...["Listen (TV story)"], Hell Bent [+]Loading...["Hell Bent (TV story)"])
Rassilon's Ultimate Sanction would have brought about the "end of time" in a more literal sense as "Time itself cease[d] to be". (TV: The End of Time [+]Loading...["The End of Time (TV story)"])