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Kyle XY

1-10 Endgame

At the height of Kyle’s search, all of his questions may soon be answered. The rollercoaster ride for Kyle and the Tragers isn’t over after the scare at the carnival when a couple, David and Julie Peterson, who claim to be Kyle’s birth parents, unexpectedly show up at the hospital to take him home with them. After hearing the Petersons’ story of whom he is, Kyle isn’t convinced and takes matters into his own hands as he tries to track down Foss, demanding answers.

Kyle and Josh attend Amanda's confirmation, where Kyle remarks on religion and its place in the world. Kyle gives Amanda a pendant of the patron saint for those who lost a parent, and Amanda tells Kyle there is a saint for "nearly everything." Kyle says he needs a saint for lost memories. Later, Kyle is sitting alone in a pew inside the church when a stranger sits beside him, discussing religion and Kyle's specific problem of lost memories.

While Kyle is out walking in the park, he is being stalked by Reynolds, and is suddenly attacked by a mysterious man who knocks Kyle out with chloroform. The man turns out to be Foss, who brings Kyle to the forest to help Kyle remember the events of the night when Foss murders Kern. Foss and Kyle's time is cut short, however, as Foss is shot in the arm by Reynolds in a failed murder attempt. Despite not knowing how to drive, Kyle gets behind the wheel of Foss' truck and is able to safely escape to a secluded area of the forest. Foss, refusing to seek medical attention, finally gives Kyle a few clues about where he comes from and who he is, such as Kyle has no memories before he awoke in the woods, because according to Foss, "for all intents and purposes" Kyle "did not exist."

After their talk in the woods, Kyle returns home and claims the Petersons are his family, and supposedly with his memory restored. To prove this, he recounts a detailed family vacation to the Petersons, who remember as well. He says they took him to Hawaii, where he saw his first palm tree, and to the Whispering Corridors. He also says he sailed on a rainbow sailboat. Kyle hastily says he can leave immediately, and prepares to leave Seattle. The distraught Tragers and others must now deal with saying good-bye to the teenager they have all come to love.

Before Kyle leaves, his friends and families, except for of a stoic Nicole, all appear to be choked up and sad, especially Amanda, who gives Kyle a hug and tells him that it's not goodbye, but "see ya." Nicole says that she is happy Kyle found his memories. Kyle eventually leaves with his supposed parents, but not before talking to Charlie about admitting his unfaithfulness to Amanda, and telling Declan, whom he feels he can trust, that he "left some things for" him.

In the Petersons' car, Kyle tells them that they are "good liars." They respond that it's their job to protect him. Meanwhile, back at the Trager house, Nicole, alone in her bedroom, finally breaks down into tears over losing Kyle. Declan goes to Kyle's room and finds a box Kyle left for him. Inside is an issue of National Geographic (bearing the fictitious title of "Earth Geographic" in the show) with a palm tree on the cover, a postcard tucked inside, a page detailing the Whispering Corridors, and a toy sailboat with a rainbow sail, all of which indicate that Kyle fabricated his vacation memory.

The Petersons bring Kyle to a gated mansion, and it turns out that both they and Foss have been working for the long-missing Adam Baylin, who was the stranger Kyle met in the church, and looks like an older version of Kyle. He promises to tell Kyle everything. It is revealed that Kyle, or 781227, is a "failed" experiment, as he was never meant to survive in the outside world, and that "The Company" (originally called Madacorp, but revealed to be named "Zzyx") is making #781228, which is labeled XX and "in excellent condition." The season ends with a closeup of 781228 inside an incubation chamber, suspended in a pink substance.

The fact the second part of the show's title is XY, and Kyle's "superior" experiment is XX, have led to speculation that #781228 is female.