The Temporal Scanning Service was a governmental agency on Gallifrey which monitored the web of time for signs of temporal interference. Their work was overseen by a special sub-committee of the High Council. They once detected a severe incursion caused by Players which demanded a creative response. The TSS' oversight committee recommended dealing with the problem by sending a special agent. Since the Second Doctor had just been condemned to death, he was an excellent candidate for working with the Celestial Intervention Agency to solve the problem that the TSS had detected. (PROSE: World Game)

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