Byron Moore was a Smallville teenager who gained super strength after a behavioral experiment. While not evil by nature, the drugs he was given had altered his behavior, which had monstrous side effects. He was a major antagonist in the Second Season of Smallville appearing in the episode "Nocturne".
He was portrayed by Sean Faris.
Byron was an aspiring poet but had displayed behavior that were labeled as "anti-social" that caused concerns for his parents. Wanting to "cure" his condition, Byron's parents signed him up for a medical trial at Metron Pharmaceutical Labs. The drug altered his biology as he could no longer be in sunlight, or he'd gain superhuman strength and become violent. His parents locked him in the basement of their house and faked his death to protect him. He had a death certificate signed by Dr. Emil Jenkins.
Byron managed to break out of the basement and became fascinated with Lana Lang and left her a poem on her parents' grave. As she opens it, Byron runs frantically through the woods. Byron falls on his back and his father, who appears to be out hunting him with a hound, shoots him with a tranquilizer and throws him back down in the cellar and threatens to kill him if he ever sneaks out again, and installs a stronger door on the cellar. Later Byron was writing another letter to Lana when his mother comes down to the cellar to bring him a book. He complains to her about having to stay in the cellar, but she assures him that it is better this way. When she leaves, he moves a poster from the wall and removes several cinder blocks. Byron found Lana at her parents' grave and had fallen asleep waiting for him. When she wakes up, he runs away, but she calls out to him and stops him. They briefly talked but the sudden appearance of Clark startled Byron and fell back, hit his head on a stone, and faints.
Clark and Lana take Byron to the Talon and feed him chocolate cake where he quotes Shakespeare and explains that he has been home schooled. Clark notices scars on his wrists. When Byron hears the morning milk truck, he becomes very anxious to get home before his parents wake up. When Byron tried to get home quick, his mother pulled him into the house but Byron's father caught him and pointed his gun at him, Clark and Lana. When Clark and Lana returned with Sheriff Ethan Miller, Mr. Moore claims that his son died eight years ago and he has never seen Clark or Lana and accuses them of playing a cruel joke on them. The sheriff leaves, but he promises Jonathan that he will get a warrant. Meanwhile, Byron is in the cellar, chained to the wall.
Clark and Pete later return to Byron's house. They go through a boarded-up window and find the cellar door. Byron asks to be left alone, but Clark breaks his bonds and carries him outside. When he gets out into the sunlight he falls to the floor of the porch and growls. When he stands up, he throws Clark across the yard, and when he turns to Pete, his eyes are black. He throws Pete into a car and runs off.