Clark arrives with Pete at the Smallville Retirement Center to do volunteer work-and to be closer to Lana, who also volunteers at the center. They meet Cassandra Carver, the blind senior citizen they've been assigned to. It's rumored that Cassandra can see the future of those she touches, an ability she quickly demonstrates by informing Pete that he'll be walking home (Pete unwittingly locked his keys in the car). Meanwhile, Lana takes her charge, Harry Volk, outside for a walk. After Lana leaves to get him a sweater, Harry accidentally tips over his wheelchair and falls into a koi pond lined with glowing green stones. Harry comes out of the water, miraculously changed from an old man to a young one. At the same time, Cassandra takes Clark's hand and ominously tells him that someone close to him will die soon.
At the Kent Farm, Clark tells his parents about Cassandra's prediction, but Jonathan and Martha are unimpressed. Later, Young Harry is at the Beanery, flirting with a cute waitress, Zoe. Clark, Lana, and Chloe enter, discussing Harry's mysterious disappearance from the retirement center. Harry can't help but butt in to their conversation. "Good luck finding your missing old person," he offers as he leaves. Back at the retirement center, Harry demonstrates his abilities as a concert-level pianist. Cassandra is listening and is impressed. Harry tells her that he was supposed to attend the Metropolis Conservatory. Cassandra, sensing something unusual about this young man, tries to get Harry to take her hand so she can see his future. Harry, however, declines: "...I already know my future." Meanwhile, Clark tells Lex about Cassandra's warning. Lex, too, is unimpressed, but Clark is worries about her ominous prediction. That night, Clark arrives at the retirement center to find Lana already there. She's examining "Young & Old" photos of the retirement center residents, noting that Harry's "young" photo is missing. She also informs Clark that it turns out Harry was a murderer who changed his name after being released from prison. When his piano teacher recommended someone else for a scholarship to the Metropolis Conservatory, Harry killed his teacher's son. Meanwhile, Harry impersonates a utilities worker to gain entrance to Jim Gage's home. After making sure that Jim is the son of Randolph Gage, Harry kills him. Back at the retirement center, Clark approaches Cassandra, wanting to know more about his future. Cassandra takes Clark's hand and they see a vision of his future: Clark in a rainy graveyard, Martha and Jonathan's gravestones, gravestones radiating out in every direction for as far as the eye can see. They snap out of the vision, horrified. Clark speeds off.
At home, Clark tells his parents about the vision Cassandra gave him, and reminds his parents that Cassandra lost her sight in the meteor shower. His parents try to convince Clark that only he controls his destiny. Later, Lex visits Cassandra, wanting to know what she saw about Clark, but Cassandra is unwilling to tell, even when Lex offers to pay her. Instead she tries to goad Lex into letting her see his future, but Lex feigns disinterest. Later, in Clark's loft, Pete and Chloe fill Clark in on Jim Gage's murder. They also show Clark a photo of Harry from the '40s-he looks just like the kid they saw at the Beanery. They go to the retirement center, and while Chloe and Pete check out Harry's room, Clark visits Cassandra. Cassandra is surprised that Clark was able to see the vision of his future; normally, only Cassandra can see the visions. She knows Clark is different and that he has a special purpose. She takes his hand and Clark again has a vision of the future: a woman, wearing a tiny unicorn necklace, being attacked. Clark then catches up with Chloe and Pete who have discovered some newspaper clippings in Harry's room. One of them features the Beanery waitress, Zoe, and her unicorn necklace. Clark races off. Meanwhile, Harry and Zoe are alone at the Beanery. Harry reveals that he intends to kill Zoe because her grandmother helped destroy his future. Clark arrives just in time to save Zoe from an oncoming truck. Harry then tries to stab Clark, but the knife blade shatters on Clark's chest. Clark hurls Harry into a dumpster.
Later, with Harry is in the hospital, Clark visits Lex. Lex shows Clark the ruined Porsche Clark rescued him from the day they met. Lex says that no one can explain how he was rescued from the Porsche. Clark does his best to avoid the issue, but it's clear that Lex is suspicious. Meanwhile, at the hospital, a deputy arrives to take Harry to jail, only to find an old man in his hospital bed. It seems the effects of the fountain-of-youth koi pond have worn off. Not realizing that Young Harry and Old Harry are the same person, the police return Old Harry to the retirement center. Clark, however, suspects the truth and goes to Harry's room to confront him, but Harry admits nothing. After Clark leaves, Harry returns to the koi pond. At the Torch office, Clark, Chloe, and Pete are discussing the situation when Lana arrives. She tells them that Harry is missing. Clark and Chloe then realize that Harry is killing the descendents of the jurors who convicted him-and juror number 11 was Hiram Kent, Clark's grandfather! At the Kent Farm, Martha Kent opens the front door to find Young Harry, there to inspect a "gas leak."
Martha is incredulous and quickly deduces that Harry is not from the gas company. Harry confronts her, but Martha escapes from the house and hides out in an empty grain silo. As headlights cross the silo grate, Harry's knife shoots through, almost cutting Martha. Harry enters the silo. As Martha backs away she pulls a dangling cord, releasing a torrent a grain from above. Both Martha and Harry are being quickly buried alive. Outside, Jonathan and Clark arrive at the same time. Clark uses his x-ray vision to locate Martha and Harry. He rips a panel off the silo and digs Martha out. Jonathan begins CPR and soon, Martha is revived. The next day, Lex visits Cassandra, ready to know his future. Cassandra takes Lex's hand and his vision begins. Lex is in the Oval Office, dressed in a white suit. He steps outside into an endless field of sunflowers. Reaching down with a gloved hand, Lex touches one of the flowers. The flower wilts and dies, the rest of the flowers then follow suit. A drop of red falls from the darkened sky, staining Lex's suit, then another. A torrent of blood falls from the sky. The vision ends and Lex, who did not see it, asks Cassandra what she saw. But Cassandra is dead, the shock of Lex's future having killed her. Backing out of the room, Lex calls for help. A nurse enters, followed by Clark, but it's too late. The person close to Clark who was to die was Cassandra.