Continuity
The Santa robots make another appearance in "The Runaway Bride", this time under the control of the Empress of the Racnoss.
Harriet Jones appears again in the episode "The Stolen Earth" and identifies herself as the former prime minister. The running gag in this episode, where Jones identifies herself and people tell her they know who she is, is carried over to her next appearance.
The Doctor's severed hand would turn up in several subsequent episodes. In "Utopia", Captain Jack Harkness turns up with the hand, which he has been using to track the Doctor. In "The Sound of Drums"/"Last of the Time Lords", the Master uses the hand to genetically alter the Doctor. In "The Doctor's Daughter", the hand is shown in the TARDIS bubbling. In "The Stolen Earth"/Journey's End" the hand is imbued with regeneration energy and grows into the meta-crisis Doctor after being touched by Donna Noble.
Read more about this topic: The Christmas Invasion
Famous quotes containing the word continuity:
“Continuous eloquence wearies.... Grandeur must be abandoned to be appreciated. Continuity in everything is unpleasant. Cold is agreeable, that we may get warm.”
—Blaise Pascal (1623–1662)
“Only the family, society’s smallest unit, can change and yet maintain enough continuity to rear children who will not be “strangers in a strange land,” who will be rooted firmly enough to grow and adapt.”
—Salvador Minuchin (20th century)
“If you associate enough with older people who do enjoy their lives, who are not stored away in any golden ghettos, you will gain a sense of continuity and of the possibility for a full life.”
—Margaret Mead (1901–1978)