Season 4 aired between 28 Sep 2008 and 10 May 2009, 22 episodes.
Episodes
E01
Sacrifice
28 Sep 2008
E02
Sudden Flight
05 Oct 2008
E03
Sex Trade
12 Oct 2008
E04
The Conduit
19 Oct 2008
E05
Dancing Lessons
26 Oct 2008
E06
Inquisition
02 Nov 2008
E07
Into Hell, Part One
09 Nov 2008
E08
Into Hell, Part Two
16 Nov 2008
E09
Shadow Riders
23 Nov 2008
E10
Misled & Misguided
30 Nov 2008
E11
Switchblade
21 Dec 2008
E12
Bad Beat
04 Jan 2009
E13
The Spear of Destiny
11 Jan 2009
E14
The Last Nazi
15 Feb 2009
E15
Hero
08 Mar 2009
E16
Hill 60
15 Mar 2009
E17
Flesh and Blood
22 Mar 2009
E18
Best Laid Plans
29 Mar 2009
E19
Whiplash
12 Apr 2009
E20
Chaos Theory
26 Apr 2009
E21
Endgame
03 May 2009
E22
Unknown Soldier
10 May 2009