Alias (2001)

S4E17 A Clean Conscience

Nadia receives a distressing call from her old caretaker, Sophia, who has been brutally attacked. When they meet, Sophia reveals that the assault was a result of someone searching for Nadia. Concerned, Sloane and Jack decide it’s time to share the truth with their daughters: Elena Derevko, the most ruthless of the Derevko sisters, has been monitoring both Sydney and Nadia for ten long years. At the same time, Jack’s doctor urges him to open up to Sydney about his health condition.