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ChronosCorp HQ was a company which researched time travel under the leadership of eccentric billionaire Alastair Montague, who created a time machine.

The experiment, however, went wrong and caused a rift in time and space through which the Cybermen tried to break through.

The calamity was discovered by the Thirteenth Doctor who sent her companions to sort it out. (NOTVALID: Worlds Collide)

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