Kryptonite Kills Superboy : Season 1 Episode 12

A Kryptonite meteor falls in Addis Ababa and is sent to Shuster for study. It turns up in one of Clark's classes, a class on minerals. There, Clark feels the pain of kryptonite for the first time. But Lex Luthor learns of it's value as an energy source and takes a piece of it. He uses it to power a machine that can knock out lights all over the city and allow him to loot stores and banks. When Superboy stops him, Luthor gives the rock to his girlfriend on a necklace. When a fire breaks out in Luthor's dorm during a date, Superboy attempts a rescue and is made powerless by the kryptonite. Now Luthor's evil may cause his own death. Luthor escapes the fire leaving his girlfriend there to die. He send Leo back in to get the necklace, and once the necklace is gone Superboy returns to normal and escapes to bring Luthor to justice. Professor Peterson then gives Superboy the kryptonite in a lead box and Superboy throws it into space.