Season 20 aired between 14 Jan 2008 and 31 Mar 2009, 14 episodes.
Episodes
E01
Oswald's Ghost
14 Jan 2008
E02
The Lobotomist
21 Jan 2008
E03
Eyes on the Prize (7 & 8): The Time Has Come/Two Societies
03 Feb 2008
E04
Grand Central
04 Feb 2008
E05
Eyes on the Prize (9 & 10): Power!/The Promised Land
10 Feb 2008
E06
Eyes on the Prize (11 & 12): Ain't Gonna' Shuffle No More/A Nation of Law?
17 Feb 2008
E07
Eyes on the Prize (13 & 14): The Keys to the Kingdom/Back to the Movement
24 Feb 2008
E08
Kit Carson
18 Feb 2008
E09
Buffalo Bill
25 Feb 2008
E10
Minik: The Lost Eskimo
31 Mar 2009
E11
Walt Whitman
14 Apr 2008
E12
Roberto Clemente
21 Apr 2008
E13
George H.W. Bush (1)
05 May 2008
E14
George H.W. Bush (2)
06 May 2008