4 - 22Unknown SoldierMay. 10, 2009- 4 - 21EndgameMay. 03, 2009
- 4 - 20Chaos TheoryApr. 26, 2009
- 4 - 19WhiplashApr. 12, 2009
- 4 - 18Best Laid PlansMar. 29, 2009
- 4 - 17Flesh and BloodMar. 22, 2009
- 4 - 16Hill 60Mar. 15, 2009
- 4 - 15HeroMar. 08, 2009
- 4 - 14The Last NaziFeb. 15, 2009
- 4 - 13The Spear of DestinyJan. 11, 2009
- 4 - 12Bad BeatJan. 04, 2009
- 4 - 11SwitchbladeDec. 21, 2008
- 4 - 10Misled & MisguidedNov. 30, 2008
- 4 - 9Shadow RidersNov. 23, 2008
- 4 - 8Into Hell, Part TwoNov. 16, 2008
- 4 - 7Into Hell, Part OneNov. 09, 2008
- 4 - 6InquisitionNov. 02, 2008
- 4 - 5Dancing LessonsOct. 26, 2008
- 4 - 4The ConduitOct. 19, 2008
- 4 - 3Sex TradeOct. 12, 2008
- 4 - 2Sudden FlightOct. 05, 2008
- 4 - 1SacrificeSep. 28, 2008
The fourth season of The Unit started on September 28, 2008 and introduces Bridget Sullivan and Sam McBride, new members to the unit and the team.
