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Placing his life entirely in their hands, the Doctor agrees to search for the recipient of the fourth envelope - just who is Canton Everett Delaware the Third? And what is the relevance of their only other clue: 'Space 1969'? Their quest lands them - quite literally - in the Oval Office, where they are enlisted by President Nixon himself to assist enigmatic former-FBI agent Canton, in saving a terrified little girl from a mysterious spaceman.
Placing his life entirely in their hands, the Doctor agrees to search for the recipient of the fourth envelope - just who is Canton Everett Delaware the Third? And what is the relevance of their only other clue: 'Space 1969'? Their quest lands them - quite literally - in the Oval Office, where they are enlisted by President Nixon himself to assist enigmatic former-FBI agent Canton, in saving a terrified little girl from a mysterious spaceman.
Guest stars
Alex Kingston
River Song
William Morgan Sheppard
Old Canton Delaware
Stuart Milligan
President Richard Nixon
Chukwudi Iwuji
Carl Peterson
Mark Griffin
Phil
Sydney Wade
Little Girl
Nancy Baldwin
Joy
Henrietta Clemett
Matilda
Hermeilio Miguel Aquino
Busboy
Mark Sheppard
Canton Delaware
Marnix Van Den Broeke
The Silent
Crew
Toby Haynes
Director
Steven Moffat
Writer