48. President Nixon Takes a Phone Call
From: "The Impossible Astronaut"/ "The Day of the Moon"
Premiere: April 23, 2011 / April 30, 2011
Iconic and paranoid, President Richard M. Nixon plays a major part in one of Eleventh Doctor Matt Smith's most befuddling adventures. United with Amy Pond (Karen Gillan), Rory Williams (Arthur Darvill) and River Song (Alex Kingston) in Utah, the Doctor encounters a mysterious astronaut who rises from a lake with a deadly mission – and the whole crew encounters the Silence – or Silents, depending on who you ask – an alien invasion force that no one can remember seeing.