Jack corners Sloane, who calmly denies his involvement and points out his lack of motive. They conclude that someone is setting Sloane up.

The Sloane impersonator (Sloane 2) shows a Rambaldi manuscript to Sinclair, saying that he needs her expertise. Sinclair says that she needs a transformer coil for this experiment to work and Sloane 2 tells her that she needs to find another way. He has his man Carter torture her.

In the APO office, Jack tells Syd and Vaughn that Sloane is not behind these conspiracies. They then use a handcuffed Roberts to confirm that APO's Sloane is not the man who hired him. Sloane orders the team to find the phony and they persuade Roberts to meet with Carter about the transformer coil.

With the APO team undercover, Roberts walks in a hotel lobby carrying the transformer coil in a secure case. Vaughn tells Roberts that when Carter comes, they'll move in and make the arrest. A man approaches Roberts, saying he's there to make the swap - but the exchange should take place in the penthouse. Though concerned that it wasn't Carter, Roberts complies.

As Roberts rides a glass elevator up to the penthouse, Syd sees Sloane 2 on his way down in another elevator. She reports it to Sloane, who predicts that Sloane 2 will cut the cable. As soon as he says this, Roberts' elevator crashes to the ground. Carter retrieves the coil, which he hands to Sloane 2.

At the APO office, Sloane suggests excusing himself from this mission since it concerns his past obsession, Syd urges him to stay so they can anticipate Sloane 2's next move.

After leafing through a Rambaldi manuscript under close surveillance, Sloane tells the team that Sloane 2 is constructing an energy source that requires the transformer coil. To do it, a nuclear physicist specializing in quantum electrodynamics is needed, and Jack adds that Dr. Sinclair, who fits the bill, disappeared last week. Sloane further states that the experiment needs Zanthium 242 to be successful. He calls a Sicilian contact who trades illicit chemicals and confirms that an "Arvin Sloane" ordered a large amount of Zanthium, to be shipped the next morning. Sloane travels to Sicily to intercept the shipment and find out where it's headed.

Disguised as delivery agents, Sloane and the team arrive at Sloane 2's facility in Chile. The team splits up with Sydney and Sloane going to the lab; while Vaughn, Weiss and Nadia attempt to rescue Sinclair.

Sloane helps Sydney break into the lab, where they recognize the Rambaldi energy source, a rotating red ball hovering over magnets. Just then, Vaughn radios to say that Sloane 2 and his henchmen escaped with Sinclair and are heading her way.

Sydney battles the thugs as Sinclair hides and Sloane 2 escapes. Carter arrives at the lab and mistakes the real Sloane for his employer. Sloane shoots him in the kneecap and demands to know what's going on. Carter babbles about immortality, to which Sloane replies that Rambaldi's secrets would never be revealed to such a fool. Sloane beats him silly.

Nadia arrives at the lab, sees the Rambaldi experiment before her. She also sees the darker side of Sloane - enraged and blood-spattered. He turns to Nadia and says quietly, "It's all over now."