13 of 13 episodes
S04E01
The Beginning of the End
January 31, 2008
S04E02
Confirmed Dead
February 7, 2008
S04E03
The Economist
February 14, 2008
S04E04
Eggtown
February 21, 2008
S04E05
The Constant
February 28, 2008
S04E06
The Other Woman
March 6, 2008
S04E07
Ji Yeon
March 13, 2008
S04E08
Meet Kevin Johnson
March 20, 2008
S04E09
The Shape of Things to Come
April 24, 2008
S04E10
Something Nice Back Home
May 1, 2008
S04E11
Cabin Fever
May 8, 2008
S04E12
There's No Place Like Home (1)
May 15, 2008
S04E13
There's No Place Like Home (2)
May 29, 2008
17 of 17 episodes
S05E01
Because You Left
January 21, 2009
S05E02
The Lie
January 21, 2009
S05E03
Jughead
January 28, 2009
S05E04
The Little Prince
February 4, 2009
S05E05
This Place Is Death
February 11, 2009
S05E06
316
February 18, 2009
S05E07
The Life and Death of Jeremy Bentham
February 25, 2009
S05E08
LaFleur
March 4, 2009
S05E09
Namaste
March 18, 2009
S05E10
He's Our You
March 25, 2009
S05E11
Whatever Happened, Happened
April 1, 2009
S05E12
Dead Is Dead
April 8, 2009
S05E13
Some Like It Hoth
April 15, 2009
S05E14
The Variable
April 29, 2009
S05E15
Follow the Leader
May 6, 2009
S05E16
The Incident (1)
May 13, 2009
S05E17
The Incident (2)
May 13, 2009
17 of 17 episodes
S06E01
LA X (1)
February 2, 2010
S06E02
LA X (2)
February 2, 2010
S06E03
What Kate Does
February 9, 2010
S06E04
The Substitute
February 16, 2010
S06E05
Lighthouse
February 23, 2010
S06E06
Sundown
March 2, 2010
S06E07
Dr. Linus
March 9, 2010
S06E08
Recon
March 16, 2010
S06E09
Ab Aeterno
March 23, 2010
S06E10
The Package
March 30, 2010
S06E11
Happily Ever After
April 6, 2010
S06E12
Everybody Loves Hugo
April 13, 2010
S06E13
The Last Recruit
April 20, 2010
S06E14
The Candidate
May 4, 2010
S06E15
Across the Sea
May 11, 2010
S06E16
What They Died For
May 18, 2010
S06E17
The End
May 23, 2010