4 - 22Before the FloodMay. 25, 2005- 4 - 21Search and RescueMay. 18, 2005
- 4 - 20The DescentMay. 18, 2005
- 4 - 19In Dreams...May. 11, 2005
- 4 - 18MirageMay. 04, 2005
- 4 - 17A Clean ConscienceApr. 27, 2005
- 4 - 16Another Mister SloaneApr. 20, 2005
- 4 - 15PandoraApr. 13, 2005
- 4 - 14NightingaleApr. 06, 2005
- 4 - 13TuesdayMar. 30, 2005
- 4 - 12The OrphanMar. 23, 2005
- 4 - 11The Road HomeMar. 16, 2005
- 4 - 10The IndexMar. 09, 2005
- 4 - 9A Man of His WordMar. 02, 2005
- 4 - 8EchoesFeb. 23, 2005
- 4 - 7DétenteFeb. 16, 2005
- 4 - 6NocturneFeb. 09, 2005
- 4 - 5Welcome To Liberty VillageJan. 26, 2005
- 4 - 4IceJan. 19, 2005
- 4 - 3The Awful TruthJan. 12, 2005
- 4 - 2Authorized Personnel Only (2)Jan. 05, 2005
- 4 - 1Authorized Personnel Only (1)Jan. 05, 2005
The action explodes in the phenomenal fourth season when Sydney leaves the CIA to join a powerful new Black Ops unit, having no idea of the reunion in store for her.
