Whitney falls in with some former jocks who have kryptonite tattoos that give them the power to walk through the walls. Meanwhile, Chloe is seriously injured and Lex has his own plans.

On a class trip, Clark and a fellow student named Eric are struck by lightning, and because Eric was holding a piece of kryptonite, Clark's powers are transferred into him.

A salesman has a kryptonite-based ability to force anyone he touches to obey his commands.

An invisible stalker is pursuing Lex and one of the household staff may, or may not, be responsible.

Clark visits Metropolis in this episode, and does a secret good deed - a police detective named Phelan witnesses his action and begins blackmailing Clark to help protect him from an IA investigation.

An experiment at the Luthor fertilizer plant makes an old friend of the Kents literally shake and jitter, and he seeks vengeance against the Luthors, who hide the secret of his transformation behind "Level Three" at the local plan...

A weight-obsessed teen dieting on kryptonite-infected vegetables gains her fondest dream...but must feed on the fat of others to maintain her enhanced appearance.

An old man uses green meteor rock to reverse the aging process, then gain vengeance on the children of the jury that put him away decades earlier. Meanwhile, another woman at the same old folks' home has prophetic abilities and she see...

A jock named Sean gains the ability to absorb heat from everything and everyone around him, and begins preying on people to gain the heat he needs to survive.

Clark begins experiencing "vision problems" as his x-ray vision begins manifesting. Meanwhile a mysterious shapeshifter is going about town using his or her abilities to steal and get others in trouble.

An abusive and hot-tempered football coach gains the ability to control and project fire.

Clark must deal with Greg, a nerdish bug collector with a crush on Lana who gains the ability of various insects and uses them to lash out at anyone who opposes him.

The first episode tells the story of the meteor shower that hit Smallville and changed life in the Kansas town forever. Clark Kent meets Lex Luthor for the first time and encounters the first in a long line of humans mutated by strange gree...

Meredith and Derek work on their last patient in their clinical trial, as the other surgeons try desperately to free a hardening block of concrete. Izzie helps Alex care for Rebecca, and Lexie discovers important information about George�...

Dr. Wyatt refuses to let Meredith give up on therapy. Alex learns something else about Rebecca. The Chief wants Erica to perform a daring surgery. Cristina continues to act strange. Alex gets to know about Rebecca's fake pregnancy. Thi...

Meredith continues on with her clinical trial. George becomes the Chieves intern, while Yang tries to deal with the fact that Burke won an award and didn't mention her name. Stevens finds it difficult to tell Alex about Rebecca's ...