When Clark Kent buys a ruby ring, the stone is indeed red kryptonite. His personality is affected, and the former sweet and friendly teenager becomes dark, selfish and ambitious, hurting his stepparents and his closest friends. He dates Lana Lang, but the rebel Clark dumps her to be with the hot new-arrival in town Jessie Brooks (Sara Downing) in a night-club. But Jonathan Kent does not give up on him and tries to save Clark from the effects of the red stone.
"Red" is definitely the best episode of Smallville up to this moment. The modification of the character and personality of Clark Kent leaves wounds in Lana Lang and Jonathan Kent, and I want to see the consequences of his acts in the next episodes. My vote is ten.
Title (Brazil): "Rebeldia" ("Rebellion")