The mineral kryptonite is used as a recurring plot device throughout the series. Kryptonite is shown to have bizarre and lingering effects on human physiology and the young superhero often encounters mutated and psychotic villains who have developed bizarre powers, such as psychic abilities, shape shifting, and other paranormal abilities. (For this reason, the show is often criticized as being predominately a "freak of the week" series.) On a Kryptonian like Clark, though, kryptonite has very different effects; the general idea is that Clark is virtually invincible except when around the kryptonite rocks. Different colors affect Clark differently: Green Kryptonite physically weakens him and could possibly kill him if he is exposed to it for too long. Red Kryptonite causes him to set aside moral standings and act out on his impulses and dark desires. Black Kryptonite splits Clark into (and merges him back together from) two separate beings that exhibit his two personalities (Clark Kent and the darker Kal-El). Silver Kryptonite (which is solely the creation of Milton Fine in the show) causes him extreme paranoia. Blue Kryptonite takes away his abilities, but doesn't cause him pain like green kryptonite is often seen to. Lastly, Gold Kryptonite can permanently damage or scar a Kryptonian and take away their powers permanently.
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