Smallville Season 4 - Episode 17: Onyx
Synopsis
A black kryptonite explosion splits Lex in two and his evil side - Alexander - is released. Alexander imprisons Lex in the mansion then gives full vent to his evil side - he threatens to evict Lana from the Talon unless she becomes his mate, jousts with Lionel, and tries to kill Clark and Chloe when they figure out his secret.
Full Recap
At LuthorCorp, Lex is working with Dr. Sinclair on a piece of green kryptonite. They initiate a thermal sequence to tap into its radiation and expose it to seeds. But the experiment goes awry and as the kryptonite blackens, it cracks and explodes. The blast devastates the lab and as Lex takes Sinclair to the hospital . . . another Lex crawls from the wreckage.
Clark and Chloe meet with Lex at the hospital and he offers to take Clark and show him the experiment. In Dr. Sinclair's room, Lex visits Sinclair and wants to know if the doctor saw anything . . . like him splitting in two. When Sinclair says he might have a way to reverse the process, "Lex" (henceforth referred to as Alexander) kills him with an air bubble to the intravenous. Chloe sees Alexander come out as the doctors rush to Sinclair's aid. At the lab, Lex reveals anything grown from the seeds turns rotten and Clark weakens from the nearby kryptonite. Alexander, secretly in the lab, sees the weakened Clark. At the manor, Lex meets Lionel and promises to show up at Lionel's charity benefit . . . in return for it being held at LuthorCorp Plaza in Metropolis. After Lionel leaves, Alexander shows up and knocks out Lex, putting him in the wine cellar.
It soon becomes clear that Alexander embodies Lex's evil impulses and that he won't kill Lex until he knows how that might affect him. Alexander puts an iron mask on Lex and leaves him there. Clark and Chloe compare notes and are puzzled by the fact they were both with Lex. While Chloe checks the hospital security tapes, Lana comes back to her apartment to find Alexander waiting for her after she called him to talk about Jason. Alexander starts putting the moves on her and Lana slaps him and tells him to get out. He does so . . . after saying he'll close the Talon. Later Lionel confronts Alexander when he cancels the fundraiser and Alexander agrees to let him have the fundraiser . . . if he sword-duels with him. He taunts Lionel into knocking him down and holding him at swordpoint, but his father can't bring himself to hurt him so Alexander scars him across the cheek.
Lana is at Clark's barn and briefs him on Alexander's activities, and Chloe confirms via the security tape that there are two Lexs. Clark goes to confront Alexander, who can answer his questions about the previous evening since he was secretly in the lab. Clark tells Alexander everything and Chloe and Clark meet him at the lab. He leaves them there and Clark finds a piece of the altered black kryptonite that hurts him, and a locker with an unconscious Lex in a security uniform. Alexander drops a girder on them, knocking Chloe out, but Clark breaks free, much toAlexander's surprise as he makes his escape.
Back at the Kent farm, Clark and Chloe have a moment and then Chloe goes to stay with Lois for her own protection. After warning Lana, Clark goes out to the barn where Alexander confronts him and offers him a place at his side. Clark refuses and he exposes Clark to a piece of green kryptonite mounted on a ring. Alexander pulls a gun on Martha and Jonathan as they rush in and shoots Jonathan to convince Clark to join with him.
After taking Jonathan to the hospital, Clark searches the manor and finds and frees Lex, but Alexander shows up with the kryptonite. As he prepares to kill Clark, Lex interrupts him and Clark uses his heat vision on the ring, turning it to black kryptonite and merging the two back together. Clark and Lex have a moment later and Lex admits he doesn't remember anything of his duplicate's experiences. Lex apologies to Lana and then meets with Lionel, who admits that Lex has shown him the "error of his ways" and he's closing down the foundation – it's their true nature as Luthors.
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