EPISODE 1 – The Enemy Walks In
Sydney faces the crisis of her life as, in short order, she must confront her mother, find out what happened to Vaughn, and explain to Will that she and her father are double agents for the CIA. But when Will's incriminating article on SD-6 breaks, Jack must take matters into his own hands to discredit him.

EPISODE 2 – Trust Me
After turning herself in to the CIA, Irina won't communicate with anyone – except her daughter. Sydney refuses to cooperate, until a mission goes awry and crucial information falls into the wrong hands. Now, against Jack's wishes, Sydney must face Irina and find out what she knows.

EPISODE 3 – Cipher
Sydney's former nemesis, Mr. Sark, re-enters the picture, trying to launch a satellite with powerful spying capabilities. Sydney once again must turn to her mother for assistance to find out what he's looking for. But she gets more than she bargained for when a harmless question hints at a deeper secret. Meanwhile, Vaughn and Will met for the first time.

EPISODE 4 – Dead Drop
Past demons revisit all the characters as Sloane becomes confused and desperate over clues tat his wife may not be dead. At the sam time, Will meets a woman who claims to know the truth about SD-6. And Jack tries to convince Sydney that Irina is setting te stage to betray them and will go to any lengths to prove it.