A mysterious ghost haunts a hotel in India. The terrifying alien C'rizz attacks commuters in King's Cross station. Beneath a London council estate, a creature is waiting to be born. And on a distant world, an old man trades stories with a strange time traveller. Throughout his adventures in time and space, the Doctor meets so many people and each one is affected in some way. The waiter who keeps a special table for the Time Lord's granddaughter, Susan. The American student who befriends lost Lucie Miller. The teenage girl who discovers that she may be something more than human.