The Titan hides in the Chin'toka scrapyard. Seven calls Captain Tuvok and asks whether he knows anything about Riker having been arrested by Starfleet, which he negates. She also poses him a personal question to ascertain his identity. Tuvok passes this test but then makes a mistake that reveals he is a Changeling. Considering that he is to open the ceremony for Frontier Day in 36 hours, Picard surmises that the Changelings stole his body and need Jack to create a genetically perfect doppelgänger. He and Geordi try to find out whether Soong's M-5-10 knows more about what their enemies want. But it turns out that Data and Lore are struggling for the control of the android, and all they learn is that there may be some "anomalous form" inside Picard. On the bridge, Seven receives a compromised prefix code originating on the Shrike, a sign that Riker was captured by Vadic. Picard and Jack come up with a trap for the Changelings. With the Titan powered down and Jack posing as the only survivor, they trick Vadic and her crew, who get confined behind forcefields. Jack and Sidney La Forge too get trapped between two forcefields, and Geordi tries in vain to beam them out. This is because Lore begins to take over the ship's systems. Beverly and Picard talk with the captured Vadic, who tells them that she and nine more of her kind were subjected to cruel experiments in Project Proteus on Daystrom Station during the Dominion War, which triggered their evolution. Vadic also says that Jack doesn't belong to his parents. As the forcefields are going down because of Lore's sabotage, Picard and Beverly prepare to kill Vadic, but the Changeling can escape. Jack and Sidney get separated by a forcefield erected by Lore, and each of them has to face a Changeling. Jack somehow manages to establish a telepathic link with Sidney, so she can kill her opponent. With the knowledge where the mutant Changelings were created, Beverly and Picard find a way to track them because of residue of radioactive thelonium-847. But it is too late. Vadic and her people take over the bridge of the Titan.

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