A servant is supposed to be invisible to his employers. But someone at Lex's mansion takes that axiom literally when he uses an invisibility potion to cloak himself during a manor-wide terror spree.

The episode was rated 7.77 from 471 votes.

Clark is startled to discover he has the power of X-ray vision - a power that may be useful when he confronts a changeling-like student who can take on the appearance and emotional traits of anyone.

The episode was rated 7.77 from 611 votes.

An ex-LutherCorp employee insists that the spasmodic rages that sometimes grip him are the result of an incident that occurred on the plant's secret Level 3. But if there is a Level 3, why doesn't Lex know anything about it?

The episode was rated 7.77 from 508 votes.

A plunge into Kryptonite-infused waters acts like a fountain of youth for a retirement home resident, who is restored to the murderous ways of his sinister past. A fortune-teller foresees Lex in the Oval Office.

The episode was rated 7.83 from 544 votes.

A nemesis presumed to be dead for three years resurfaces in Smallville and stalks Lex. Chloe uncovers intriguing information about Clark's adoption.

The episode was rated 7.84 from 433 votes.

A teen's amazingly successful weight-loss regimen gives her a crazed hunger for high-fat munchies! So she munches on a deer here, a boyfriend there - she's a fat-sucking fiend and a menace to all Smallville!

The episode was rated 7.85 from 519 votes.

His Kryptonite-infused handshake seals the deal! A manipulative, wheeler-dealer entrepreneur exerts a mysterious power over Smallville residents - and even convinces Clark's dad to sell the family farm.

The episode was rated 7.87 from 468 votes.

The secret is out - perhaps. Clark performs a lifesaving act of super heroism, thinking there are no witnesses. But a nearby cop sees everything, and he has blackmail in mind.

The episode was rated 7.90 from 483 votes.

Jonathan turns against his son, Lana becomes a sexy flirt and Pete sets out to settle a score with Lex. They all exhibit unusual behavior after coming into contact with a strange, toxic flower - and there appears to be no antidote to the flower's poison.

The episode was rated 7.91 from 449 votes.

After a hit-and-run accident that destroys his drawing hand, a cartoonist is left with bitterness, pain... and an unexpected gift of telekinesis that he turns into an instrument of revenge.

The episode was rated 7.92 from 437 votes.

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 the strange green meteor rocks that accompanied him on his journey to Earth.

The episode was rated 7.95 from 1040 votes.

Lana has eerie visions involving a kidnapping of Chloe. Lex's ongoing inquiry into the mystery surrounding Clark takes an intriguing turn when a crop duster reveals what he saw fall from the sky during the Smallville meteor shower.

The episode was rated 7.97 from 424 votes.

A child who can read minds escapes his cruel parents and finds happiness with the Kents. But that joy may be brief when his parents come looking for the boy so they can use his psychic gifts in a life of crime.

The episode was rated 8.02 from 447 votes.

Let's see how the other 99.999999% live. After a fluke lightning strike, Clark experiences the joys and pains of a normal human existence, and a classmate suddenly has the powers once wielded by Clark.

The episode was rated 8.08 from 462 votes.

A reporter closes in on Clark's secret; Chloe may depart Smallville; LuthorCorp is forced to close. At least the school dance will provide carefree moments for Clark and his friends. Then the twister hits.

The episode was rated 8.28 from 466 votes.