Complete story — includes the ending
Jack seeks a doctor who might be able to cure his radiation poisoning, but the doctor cannot help him and tells Jack that he must tell Sydney. Sophia, Nadia's caretaker when she was young, calls her and she comes to Los Angeles. She reveals that she was beaten when someone came to look for Nadia. Meanwhile, Vaughn and Dixon go on a mission in Amsterdam to find an agent who might have gone rogue. Dixon's associate is actually pursuing leads on Hydrosek, a water-based weapon developed by Indonesia that could wipe out entire ecosystems and kill millions. Sloane (via Marshall) acquires intel on Sophia just to be sure she was telling the truth, but Sydney finds out. Jack and Sloane later confess that they know that someone has been watching Sydney and Nadia since they were young and acquiring information about them. It is revealed that Elena Derevko is the one who has been accumulating the information. It is then shown that Sophia and Elena are one and the same.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Alias season 4. HTML formatting and reference markers removed. · Content license