Changes

*Rory Williams (Arthur Darvill)

*Rory Williams (Arthur Darvill)

*River Song (Alex Kingston) - First introduced during the Tenth Doctor story, ''Silence in the Library''.  Later revealed to be the Doctor's wife and Amy & Rory's daughter.

*River Song (Alex Kingston) - First introduced during the Tenth Doctor story, ''Silence in the Library''.  Later revealed to be the Doctor's wife and Amy & Rory's daughter.

*Clara Oswald (Jenna Coleman) - First introduced as Oswin Oswald in ''Asylum of the Daleks.''  Also appeared in ''The Snowmen'' as a barmaid/governess in Victorian-era London.  She finally becomes a permanently in ''The Bells of St. John.''  In ''The Name of the Doctor,'' it is revealed that the reason for the previous two iterations is due to Clara jumping in to the Doctor's time-stream to defeat the Great Intelligence.  Continues to travel with the Twelfth Doctor.

*Clara Oswald (Jenna Coleman) - First introduced as Oswin Oswald in ''Asylum of the Daleks.''  Also appeared in ''The Snowmen'' as a barmaid/governess in Victorian-era London.  She finally becomes a permanent companion in ''The Bells of St. John.''  In ''The Name of the Doctor,'' it is revealed that the reason for the previous two iterations is due to Clara jumping in to the Doctor's time-stream to defeat the Great Intelligence.  Continues to travel with the Twelfth Doctor.

==Political and Social Themes==

==Political and Social Themes==