3 of 13 episodes
3 of 23 episodes
11 of 22 episodes
S04E01
Sacrifice
September 28, 2008
S04E02
Sudden Flight
October 5, 2008
S04E07
Into Hell (1)
November 9, 2008
S04E08
Into Hell (2)
November 16, 2008
S04E10
Misled & Misguided
November 30, 2008
S04E13
The Spear of Destiny
January 11, 2009
S04E18
Best Laid Plans
March 29, 2009
S04E19
Whiplash
April 12, 2009
S04E20
Chaos Theory
April 26, 2009
S04E21
Endgame
May 3, 2009
S04E22
Unknown Soldier
May 10, 2009