Lex discovers Morgan Edge is alive and gets him to admit to past crimes with Lionel.

Someone tries to kill Lex at the mansion. Lex flees and asks Clark for help. Clark begins to wonder what really happened, especially after Lionel announces Lex has had a psychotic break and must be institutionalized.

Morgan Edge reappears: Morgan Edge did not die at the docks and has changed his physical identity. Lex discovers this when he finds Edge and confronts him with evidence that shows Edge and Lionel conspired in the explosion that killed Lex's grandparents. Their motive was to split the insurance money. Lex prompts Edge to reveal the truth in a confession so Lex can have his father convicted.

What's up with Lex? A masked gunman gets into the library to assassinate Lex. Lex sees his security guard get shot. Running away, Lex escapes by jumping out the window.

Lex suspects his father or Morgan Edge hired the gunman to kill him. He asks Clark to retrieve the video confession by Edge, stored in the library safe so it can go to the authorities.

With his behavior swaying between normalcy and angry ravings, Lex says that everyone is trying to put him away to dismiss what he knows about Lionel and Edge. Lex claims he has been drugged.

What's up with Lionel? Lionel tells Clark and the Kents that Lex is missing and seriously ill, suffering a psychotic break with paranoid delusions. He asks Clark to help Lex get care.

Later when Lex confronts Lionel at gunpoint at LuthorCorp, Lionel tries to calm him down, denying wrongdoing. Lionel claims the slumlord hired Edge to cause the fire in the tenement that killed Lionel's parents. Seeing how disturbed Lex is, Lionel comments that his baby brother Julian's death was not Lex's fault. Lex demands to know the whereabouts of Morgan Edge.

What's up with Clark? Clark wants to help Lex, but isn't sure what the truth is. At the mansion, Clark finds the safe empty and the window repaired. Everything looks normal, except that Clark finds a chard of broken glass, which makes him think Lex's story is true. After Lionel's plea for help, Clark finds Lex back in the barn, cradling an imaginary baby, his brother Julian who died in infancy.

Lex knows his sanity is in doubt and wants to prove he's not paranoid. Clark accompanies Lex to the warehouse where he said he found Edge yesterday. The warehouse is a sweatshop, busy with seamstresses. Lex thinks its a cover-up and is enraged, threatening the sweatshop boss to get answers.

Back at the mansion, the security guard Lex thought was dead is alive. Lex's psychiatrist explains the broken glass, saying he threw a vase through a window in anger during a session.

Later Clark gets Lex's security guard Darius to admit to drugging Lex's Scotch. Darius got his orders by an unknown person over the phone.

What's up with Lana? At Clark's request, Lana brings food and drinks to a horse barn where Clark is hiding Lex. Lana stands watch while Clark meets Chloe to do more checking. Chloe explains to Clark that Lex's past reveals past delusions related to the death of his infant brother.

Meanwhile, Lex believes that Lana is trying to drug him when she serves him some chamomile tea to calm him. Lex storms out, pushing Lana aside into a horse's stall. The horse tramples Lana. Clark finds her unconscious.

Later at the hospital when she awakens, Lana tells Clark that she almost died from the accident. She tells Clark she must stay away from him. She realizes that being near him is too dangerous.

How it ends: Lex finds the transformed Morgan Edge and threatens him at gunpoint. Edge tells Lex he was drugged. Lionel's ideas and details were designed to put Lex over the edge of reality. Clark arrives and steps in to stop Lex from shooting. Edge punches Clark, holding a fistful of green kryptonite beads. Lex shoots Edge, then turns the gun on Clark, thinking Clark is part of the conspiracy. Edge tries to drive away while Lex shoots. Clark pushes Lex out of the way, crushing the car, pushing it aside. Lex witnesses it all. The sight sends Lex over the edge of a breakdown as the psychiatrist pulls up and they take Lex away as he babbles on about Clark and the car. Clark has disappeared before they arrived.

Lex is committed to a sanitarium. He'll have no short term memory after treatment. Lionel observes his son in a straight jacket and padded room.