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.
4 - 1Sacrifice Sep. 28, 2008
4 - 2Sudden Flight Oct. 05, 2008- 4 - 3Sex Trade Oct. 12, 2008
- 4 - 4The Conduit Oct. 19, 2008
- 4 - 5Dancing Lessons Oct. 26, 2008
- 4 - 6Inquisition Nov. 02, 2008
- 4 - 7Into Hell, Part One Nov. 09, 2008
- 4 - 8Into Hell, Part Two Nov. 16, 2008
- 4 - 9Shadow Riders Nov. 23, 2008
- 4 - 10Misled & Misguided Nov. 30, 2008
- 4 - 11Switchblade Dec. 21, 2008
- 4 - 12Bad Beat Jan. 04, 2009
- 4 - 13The Spear of Destiny Jan. 11, 2009
- 4 - 14The Last Nazi Feb. 15, 2009
- 4 - 15Hero Mar. 08, 2009
- 4 - 16Hill 60 Mar. 15, 2009
- 4 - 17Flesh and Blood Mar. 22, 2009
- 4 - 18Best Laid Plans Mar. 29, 2009
- 4 - 19Whiplash Apr. 12, 2009
- 4 - 20Chaos Theory Apr. 26, 2009
- 4 - 21Endgame May. 03, 2009
- 4 - 22Unknown Soldier May. 10, 2009