If there's ever been a famous piece of rock, it would be Kryptonite. We usually associate this fragment from the planet Krypton as one of the few things that causes our famous hero to weaken. While there are various versions of Kryptonite in the world of Superman, there has been some changes introduced in the show. Take a look below at these Smallville versions:


Green Kryptonite
First Appearance: 1.01 Pilot

The Kryptonian Achilles' Heel; this version has proven to be the most fatal to Clark. Whenever he gets exposed to it, his strength is quickly sapped from him, as the Kryptonite drains energy from his body. Not limited merely to removing his powers, it does so while causing him great pain. Prolonged exposure can even cause death. Due to the sapping of his strength, Clark often finds it difficult to even drag himself away from the kryptonite when it is near him. Lead lining appears to be the only thing that prevents the Kryptonite's radiation from harming Clark. Lana used to wear a necklace with a piece of the Kryptonite as a pendant. Clark often appeared to be a bumbling fool around her due to the effect that the rock had on his body.


Red Kryptonite
First Appearance: 2.04 Red

Another form of Kryptonite that's normally associated with Superman; however the Smallville version of the red rock has a different effect on Clark than the original. While in contact with the Kryptonite, Clark develops a rebellious if not wholly amoral personality. It causes Clark to ignore any inhibitions he has, which leads to him acting on any whim that he feels at the moment. This can make him appear more confident, since he tends to speak his mind when near this particular Kryptonite. It also causes him to be reckless with his powers, often using them in the open with no concern for secrecy. Furthermore, he tends to disregard the physical injury that he is capable of inflicting, while under the influence.


Black Kryptonite
First Appearance: 4.01 Crusade

The most mysterious of the Kryptonites on Smallville; Black Kryptonite appears to cause the splitting or creation of different personalities. The first glimpse of this new Kryptonite is when Martha used it against Clark, who appeared to be brain washed by Jor-El. When the fragment touched Clark, it caused a seeming battle of wills within Clark's body as Clark and the other personality, "Kal-El" began to fight for control. In the episode 'Onyx', experimentation with a piece of Green Kryptonite led to the creation of Black Kryptonite, which caused Lex to be split into two separate bodies. The first Lex was a compassionate caring man, while the other Lex appeared to be the immoral or "evil" one.


Silver Kryptonite
First Appearance: 5.07 Splinter

Another Smallville creation of Kryptonite, Silver Kryptonite was delivered to Lana by Brainiac as a seemingly innocent gift. However, when Clark is in contact with the meteor rock, it causes him to become extremely delusional. Seeing and hearing things that make him believe that everyone is out to hurt or endanger him, Clark becomes extremely paranoid, and dangerous as he sees his worst fears happen before him. The Silver Kryptonite was part of a ploy by Brainiac to gain Clark's trust. Brainiac was the only one able to remove the small sliver of the Kryptonite from within Clark's body and it hasn't appeared on the show since.