Are you my mummy?
The Child's plague is spreading throughout wartime London, and its zombie army is on the march. The Doctor and Rose form an alliance with the intergalactic con-man, Captain Jack, but find themselves trapped in the abandoned hospital. The answer lies at the bomb site, but time is running out.
Nancy claims it is all her fault as she is actually Jamie's mother, which she admits in front of the child. As they hug, the nanogenes identify Nancy's DNA as being his mother's and reverse Jamie's transformation so that they resemble each other; the rest is done to all the others who had been converted. Jack captures the bomb that would have fallen on the site and the Doctor and Rose rescue him before it explodes, inviting him on the TARDIS.