→Continuity
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* This episode features [[Penelope Wilton]] as [[British Prime Minister|PM]] [[Harriet Jones]]. Wilton previously guest-starred as Harriet Jones in the Ninth Doctor episodes [[DW]]: ''[[Aliens of London]]'' and ''[[World War Three]]''. | * This episode features [[Penelope Wilton]] as [[British Prime Minister|PM]] [[Harriet Jones]]. Wilton previously guest-starred as Harriet Jones in the Ninth Doctor episodes [[DW]]: ''[[Aliens of London]]'' and ''[[World War Three]]''. | ||
* This story features [[David Tennant]] in his first full episode as the Doctor. He previously made a brief appearance at the end of [[DW]]: ''[[The Parting of the Ways]]'' and in a [[Children in Need Special|7-minute "mini-episode" for Children in Need]] (which was actually filmed at some point ''after'' the Christmas special). | * This story features [[David Tennant]] in his first full episode as the Doctor. He previously made a brief appearance at the end of [[DW]]: ''[[The Parting of the Ways]]'' and in a [[Children in Need Special|7-minute "mini-episode" for Children in Need]] (which was actually filmed at some point ''after'' the Christmas special). | ||
* This is the first ''Doctor Who'' episode clearly labelled as a [[Christmas]] special. However, the seventh episode of [[DW]]: ''[[The Daleks' Master Plan]]'', titled "[[The Feast of Steven]]", was also written as a Christmas episode and was first broadcast on [[25th December|25 December]] [[1965]]. In addition, the 2005 episode [[DW]]: ''[[The Unquiet Dead]]'' was set at | * This is the first ''Doctor Who'' episode clearly labelled as a [[Christmas]] special. However, the seventh episode of [[DW]]: ''[[The Daleks' Master Plan]]'', titled "[[The Feast of Steven]]", was also written as a Christmas episode and was first broadcast on [[25th December|25 December]] [[1965]]. In addition, the 2005 episode [[DW]]: ''[[The Unquiet Dead]]'' was set at Christmas time, although it was not broadcast at that time of year. | ||
* Martians have previously landed in London in [[DW]]: ''[[The Dying Days]]''. The [[Ice Warrior]]s were also said to come from Mars. | * Martians have previously landed in London in [[DW]]: ''[[The Dying Days]]''. The [[Ice Warrior]]s were also said to come from Mars. | ||
* The Robotic Santas reappear in [[DW]]: ''[[The Runaway Bride]]''. | * The Robotic Santas reappear in [[DW]]: ''[[The Runaway Bride]]''. |