Paris, 1809. The Fifth Doctor takes a tour of the Catacombs and meets a sassy Time Agent doing the same…
Paris, 1944. The Tenth Doctor misses his target and lands in occupied France. He hides from the Nazis – in the Catacombs.
A collision of two Doctors’ timelines triggers a temporal catastrophe, granting the Cybermen dominion over the Earth.
The Doctors must travel back in time to find the source of the Cyber-invasion and close the Gates of Hell!
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