[spoiler]El Parte Dos begins with Syd and the gang at CIA headquarters looking for Will, who called Francie/Allison at the end of Part One and is in hiding in motel room somewhere. He is quickly captured and taken back to the VIP Celebrity Prison Cell.
Irina, as promised, sends Sydney the information. A quick test confirms that Will is Will, and he’s released.
Syd and Vaughn are practicing hockey. Vaughn leaves and Irina shows up. She tells Sydney to raid a warehouse in Zurich and take the Rambaldi artifacts back from Sloane. Then she knocks Sydney out.
Sark and Allison get together and Sark reveals that the doubling process can’t be reversed. He also gives Allison the gene therapy medicine she needs.
Jack is moving the DiRegno heart, the only Rambaldi artifact Sloane needs, when the convoy is attacked. Sloane’s men capture Jack and the heart. Sloane tells Jack that he’s almost finished assembling “The Telling,” a mysterious Rambaldi device that will have great power. Then walls shake and lights flash as the machine is presumably tested.
Will, working with Weiss, discovers that the second double is Allison Doren, a Project Christmas kid who was declared dead years earlier.
Syd, Vaughn, Marshall and Marshall’s new woman go to Zurich, where they find crates of kitchen appliances. Irina calls Syd later and tells her where to find Sark, who can lead them to Sloane, Jack and the artifacts.
Syd and Vaughn go to Stockholm, where Sark is captured (and beat with a table by Vaughn.) Sark tells the CIA that Sloane is in Mexico City.
A CIA raid, aided by Sark’s intel, gets Jack, but Sloane escapes with The Telling. Irina shows up to shoot Sloane’s guards and allow Vaughn to chase him, while Syd follows her. Syd has her at gunpoint on the roof, where Irina tells Syd that the Prophecy isn’t about Sloane or her, but that Sydney is the chosen one. Then Irina jumps off the building, bungees in a window and escapes.
Meanwhile, Will has discovered that Francie isn’t Francie. He leaves a voicemail for Syd, and Allison stabs him with a kitchen knife. Syd returns home, checks her voicemail and confirms that Allison isn’t Francie. They have a ten-minute fight scene that destroys the house. In the end, Syd shoots Allison and then collapses.
Syd wakes up on a street in Hong Kong with different clothes and hair. She calls the CIA from a pay phone, and Kendall quickly directs her to a safe house. While waiting for her contact, she discovers a scar on her stomach.
Vaughn enters the room, shaken, and Syd rushes to meet him. He tells her Will is okay, and that they thought she was dead. He rubs his face and reveals a wedding ring. Syd asks about the ring, and Vaughn tells her she’s been missing for almost two years. Cut to black.