Doc has no rhythm, Jack has great taste in cocktails, and aliens can’t distinguish bio matter from plastic.
The 9th Doctor and Rose continue their dark journey through WW2 London, and we learn that not only is a Captain Jack Harkness a (wannabe) conman, but he may in fact be responsible for the Gasmask Zombie epidemic that is raging on the ground while nazis bomb the city from above.
So now our three time travellers set off to find patient zero, the O.G. (Original Gasmask), determine who has the biggest sonic, solve the mystery and save the world from the creepy little boy who just wants to find his mummy.
This is the second and concluding part of a two-parter that started with N009 The Empty Child.