Not quite a sequel to Out of Time, the previous Big Finish audio drama with the same title. There’s no continuation of the plot from that story, but the idea is the same–a matchup of the 10th Doctor (David Tennant) with one of his predecessors. And since I never can resist Doctors meeting Doctors, here we are again.
Paris 1809. The story begins with the 5th Doctor (Peter Davison) on a tour of the Barrière d’Enfer (that is, the Gates of Hell), the catacombs under the city where the bones of the dead are stored. He was aiming at London 1851, but some kind of time anomaly bumped the Tardis and he ended up here instead. The tour guide, Joseph Delonne, is an aged man who has lived above the subterranean catacombs all his life and claims to know more about them than anyone else. His own father, he says, was killed when their family home collapsed into the vaults beneath in the late 1700s.
Also on the tour is a 51st-century Time Agent, Tina Drake, who seems to know exactly who the Doctor is without being introduced. “Blue box, robot dog.” She’s tracing the same paradoxical time anomaly that disrupted the Tardis back to its source in this particular time and place.
The two break away from the tour group to do a little exploring on their own. Their attention is drawn by an anachronistic flashing red light at the end of tunnel which turns out to be a button to open a secret door.
Inside, they find a troop of about 100 Cybermen in suspended animation. One who seems to be the leader immediately awakes and tells the Doctor that they have been expecting him for some time.
Tina escapes by jumping out with her vortex manipulator, but the Doctor ends in a vault where he is frozen in time.
“Catacombs, Cybermen, trapped in a stasis cage for 135 years, this” — As he sums up the adventure later.
Paris 1944. The 10th Doctor was aiming at 1922, but ran into that same anomaly “bump” and ended up in the midst of the Nazi Occupation. Fleeing the Gestapo, he seeks a hiding place in the French Resistance underground HQ in the catacombs. As he later describes it:
“Nazis, Josephine Baker, catacombs, this.”