Book excerpt: Discover the new Doctor Who classics. Earth is under attack by power-hungry aliens. This is no time for the Doctor to be out of action. When a British space probe is intercepted by a sinister alien vessel on the eve of Christmas, it marks the beginning of an audacious invasion of the Earth by the Sycorax – horrifying marauders from beyond the stars. Within hours, a third of humanity stands on the brink of death with not a single shot fired. Our planet needs a champion – but the Doctor is not fit for service. He’s just regenerated, delirious in a new body and a dressing gown. Forced into his battered shoes is his friend, Rose Tyler, a girl from a London council estate. Will she save the world from this nightmare before Christmas – or see it destroyed?