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- Played by: Adrian McMorran
- Anti-Villain: Type II
- Bully Hunter: After waking up from his coma, he goes after the bullies who tormented him in high school.
- Hoist by His Own Petard: He electrocutes himself after Clark gets him wet.
- Laser-Guided Amnesia: After he electrocutes himself.
- Older Than They Look: Due to slowed aging, he still looks like a teenager when he awakes from his coma, but is really in his late 20s.
- Shock and Awe: Can control electricity.
- Played by: Chad E. Donella
- Abusive Parents: His mother.
- Continuity Nod: His random reappearance and Heel–Face Turn in Season 10 is a possible reference to a Chloe Chronicles story where some of the bugs from his swarm form are shown to be in the possession of a scientist working on both giving himself powers and finding a cure for meteor freaks (if not for the powers, then at least the kryptonite psychosis).
- The Glasses Gotta Go: After being bitten by meteor-infected insects.
- Heel–Face Turn: In Season 10. The role in the particular episode was probably supposed to be filled by Jeremy Creek, but for some reason or other, Bug Boy was used instead.
- In a Single Bound: He can leap great distances.
- Self-Made Orphan: Greg killed his own mother.
- Shout-Out: To Spider-Man. He even shoots webbing (from his mouth).
- Super Speed: He can move fast enough to disappear from the sight of ordinary people.
- Super Strength: He could grapple with Clark.
- Stalker with a Crush: For Lana.
- Wall Crawl: He is shown clinging to walls and ceilings.
- The Worm That Walks: When Clark defeats him, his body breaks into dozens of bugs.
Coach Walt Arnold
Coach Walt Arnold
- Played by: Dan Lauria
- Berserk Button: Losing.
- Big "NO!": His last word.
- Broken Pedestal: He used to be Jonathan's coach when the latter was in high school. It becomes very clear when Arnold makes a contemptuous remark about Jonathan, who just glares at him before walking away.
- Hoist by His Own Petard: He accidentally sets himself on fire and burns to death. He seems to be so filled with rage to feel pain.
- Made of Iron: Clark throws him across a room and through a table, and he gets up like nothing happened.
- Playing with Fire: When he gets angry, everything around him burns.
- Second Place Is for Losers: Beats and threatens his players if they achieve anything less than perfection.
- Serious Business: Football.
- Took a Level in Jerkass: Implied, since Jonathan doesn't mention him being as Jerkass as he is when attempting to dissuade Clark from joining the football team.
- Villainous Breakdown: When he finds that his fire can't harm Clark, since he can't tolerate losing at anything.
- Played by: Lizzy Caplan
- Continuity Nod: Her body was seen in a Chloe Chronicles story. Pete makes a comment to her that she'll never threaten Lana again.
- Discount Lesbians: In her second appearance, when she's trying to seduce Lana, she always does so while in a male body (except for a brief moment when she's disguised as Chloe).
- Green-Eyed Monster: Towards Lana in her first appearance. She thinks Lana has the perfect life and wants to replace her.
- Hoist By Her Own Petard: See below.
- Impaled with Extreme Prejudice: On the spike she planned to use on Clark.
- Perverted Sniffing: She sniffs Lana's underwear at one point in "Visage."
- Psycho Lesbian: In her second appearance, she's realized she doesn't want to be Lana; she wants to be with Lana.
- Red Right Hand: Her bones are green when viewed by Clark's X-Ray Vision. Of course, this doesn't do anyone else any good.
- Self-Made Orphan: She accidentally pushed her mother down the stairs when she tried to take the money back.
- Stalker with a Crush: For Lana.
- Super Strength: Can fight Clark on a relatively even playing field.
- Played by: Michael Coristine
- And I Must Scream: A spin-off revealed that he's still alive, but stuck in a block of ice kept by a Mad Scientist. An explosion thaws and apparently rejuvenates him, and he appears to escape.
- Blatant Lies: "Chloe, I promise it won't hurt..."
- Expy: Probably unintentional, but he is basically Gender Flipped Killer Frost.
- Hoist by His Own Petard: Clark throws him into a lake, which freezes solid.
- Horror Hunger: For heat. He's not sympathetic because he enjoys killing people to save himself.
- Jerk Jock: Pre-transformation.
- Lack of Empathy: Already a Jerkass before gaining his powers, Sean loses all empathy for others after gaining them and clearly enjoys feeding on others.
- Likes Older Women: When he sees Martha, Sean comments to Clark that "Your mom is hot!"
- It's possible he meant it literally.
- Made of Iron: He takes quite a few hits from Clark, including one with a pipe. The frozen layer on his skin might justify this.
- Meaningful Name: Kelvin is a temperature scale.
- Monster Misogyny: All his victims are female.
- Played by: Jackie Burroughs
- Blind Seer: She lost her vision in the 1989 meteor shower.
- Cassandra: (to Clark) More than once, I've touched people, and I've seen such pain and despair. But then you were there and the pain was gone. I think that's your destiny: to help people, to save people from fear and darkness.
- Played by: George Murdock (old), Eric Christian Olsen (young)
- Disproportionate Retribution: His first murder was retaliation for not being recommended for a scholarship to the Metropolis Conservatory.
- Retired Monster: Until the Green Rocks give him a second shot at monsterdom.
- Sins of Our Fathers: He goes after the children of those he has grudges against, including Jonathan Kent (though he settles for attempting to kill Martha since Jonathan isn't home at the time.
- Played by: Amy Adams
- Anti-Villain: Type II
- Played by: Gregory Sporleder
- Played by: Rick Peters
- Psychotic Smirk: Does it a lot.
- Played by: Shawn Ashmore
- The Glasses Gotta Go: After taking on Clark's abilities.
- Instant Expert: Learns how to use Clark's powers in less than a day.
- Played by: Kavan Smith
- Played by: Ryan Kelley
- Back for the Dead: In Season 2.
- Psychic Nosebleed: In his second appearance.
- Played by: Reynaldo Rosales
- Anti-Villain: Type III
- Played by: Shonda Farr ("Drone"), Jovanna Huguet ("Cure")
- Played by: Adam Brody
- Anti-Villain: A subversion. He's played this way at first, but is soon revealed as just a whiny, homicidal psycho.
Dr. Steven Hamilton
Dr. Steven Hamilton
- Played by: Joe Morton
- Jumping Off the Slippery Slope: In "Duplicity," his desperation to vindicate himself before he dies drives him to kidnapping, torture, and murder.
- Morally Ambiguous Doctorate: In "Nicodemus," when one of his experiments is stolen and puts several people in the hospital, Lex has to coerce him into helping research a cure.
- Race Lift: Assumed originally.
- Played by: Krista Allen
- Black Widow: She married rich men and hypnotized other men to kill her husbands so they'd inherit their money.
- Played by: Jonathan Taylor Thomas
- Chronic Backstabbing Disorder: Backstabs his teacher, Lana, Chloe, and Van, and eventually tries it on Eric. That last one doesn't end so well.
- Killed Off for Real: Courtesy of Eric Summers.
- A deleted scene had him die in his first episode. But it was changed to his double falling to his death instead.
- Me's a Crowd: Can split into two.
- Shirtless Scene: Justified to facilitate aforesaid splitting-in-two. No Magic Pants in this show.
- The Sociopath: Gleefully attempts to murder Chloe and Lana at once.
- Played by: Tamara Feldman
- Died in Your Arms Tonight: Died in Clark's arms.
- Killed Off for Real: By attempting a Super Window Jump.
- Temporary Love Interest: For Clark in "Skinwalker."
- Played by: Jeremy Lelliott
- Played by: Jodelle Ferland ("Accelerate"), Amber Rothwell ("Forsaken")
- Psychopathic Man Child: In her second appearance.
- Played by: Kevin Zegers
- Death by Irony: He didn't die, but being defeated by being magnetically attracted to a metal cart is really ironic.
- More Than Mind Control: He uses magnetic powers to tweak brain signals, but it is just a shade less of actual Mind Control.
- Power Perversion Potential: Unzips Lana's shirt with them. Don't worry, nothing happened.
- Played by: Joseph Cross
- Blessed with Suck: Sees a vision of how people die when he touches them. He is often disturbed by the visions.
- Meaningful Name: According to the Smallville Wiki, Jordan's name may refer to the River Jordan in Asia. The Israelites "crossed the river Jordan" to get to the Promised Land after escaping slavery from Egypt. Since then, it has been a symbol for souls crossing into paradise after death.
- Power Incontinence: He can't turn his power off.
- Played by: Sarah Carter
- Achilles' Heel: She can't teleport if she's touching or surrounded by lead.
- Anti-Villain: Alicia is a Type II.
- Back for the Dead: In Season 4.
- Clingy Jealous Girl: She becomes obsessed with Clark, hanging pictures in his locker, scratching out Lana's picture in his yearbook, and redecorating his loft.
- Ensemble Dark Horse: Was so popular in her season 3 appearance, most likely due to Sarah Carter's strong chemistry with Tom Welling, that she was brought back for a two-episode arc the following season.
- Exact Words: She says she wouldn't tell Clark's secret to anyone as long as she is alive. No, she didn't wait till she is dead...no one said anything about a little demonstration to a very shocked Chloe.
- Femme Fatale: She teleports into Clark's bedroom to kiss him, which is fine because Clark's glad that he has someone to be with who's like him, but then she turns obsessed and decides she's going to have Clark no matter what it takes.
- Forgotten Fallen Friend: Frustratingly so. Clark mourns her death for the episode she's murder and then never mentions her again, 3 episodes after her death he's already pining over Lana again.
- Heel–Face Turn: In Season 4.
- Killed Off for Real: Courtesy of Tim Westcott.
- Stuffed In The Fridge: Textbook example. She's hanging from the noose by the time Clark found her.
- Murder the Hypotenuse: Attempts to do this to Lana.
- Not Me This Time: When citizens start getting attacked in her final episode.
- Psycho Ex-Girlfriend: Clark's
- Reformed, but Rejected: By most of the people in Smallville, mostly due to what she'd done to her father and Lana. But post-mortem, at least Chloe, Lois, and Clark's parents showed remorse for her (especially Chloe, for obvious reasons).
- Shadow Archetype: What if Chloe had all the ability to act on her crush, and none of the restraint?
- Small Role, Big Impact: She revealed Clark's identity to Chloe. Something that changed the way Chloe related to Clark for the rest of the series.
- Taking the Bullet: Literally does so for Clark to protect his secret.
- Temporary Love Interest: For Clark.
- Unexplained Recovery: Overcomes her insanity.
- Weaksauce Weakness: Her teleportation is blocked by lead.
- Yandere: She has an expressive face with kind eyes and a bright smile. In the beginning of the episode, she uses her power to protect Clark's powers, but by the end, she tried to stab Lana to death for her past with Clark.
Trent Mac Gowen
- Played by: James Bell
- Bald of Evil: Head-stubble variant.
- Blade Below the Shoulder: One of his preferred attacks.
- Elemental Shapeshifter: Into metal.
- I Just Want to Be Normal: Lionel promises to help him set up a normal life once Chloe is dead.
- Killed Off for Real: Lois electrocutes him and Clark incinerates him with heat vision.
- Professional Killer: Hired by Lionel to kill Chloe.
- Shout-Out: To the T-1000. Down to getting killed off in a foundry!
- Slasher Smile: Does this when strangling Chloe.
- Played by: Derek Hamilton
- Dishing Out Dirt: Could convert to sand at will.
- Elemental Shapeshifter: Sand.
- Frameup: Frames Alicia Baker for his murders.
- The Fundamentalist: There is a serious religious undertone to most of what Tim talks about.
- In the Blood: Inherited his belief in sin from his dad.
- Knight Templar: Believes that all those who have sinned, no matter how small the infraction, must die. To put it in perspective, he tries to kill Lana and Jason for being in a student/teacher relationship.
- He also believed the meteor shower had corrupted Smallville. It's more or less true.
- Super Strength: He was able to hit Clark across the room.
- You Are What You Hate: Inferred. He has issues with meteor freaks, blaming the meteor shower for bringing an evil to Smallville, yet he himself is one which may have caused him serious issues. However, it's never said directly that he acquired his powers from the meteors.
- Played by: Beatrice Rosen
Andrea Rojas/Angel Of Vengeance
- Played by: Denise Quiñones
Maddie Van Horn
Maddie Van Horn
- Played by: Emily Hirst
- Cute Mute: At first.
- Enfante Terrible: Subverted. While she can be very destructive, it's her dad who's the real threat.
- Happily Adopted: Not at first, having been shuttled from foster home to foster home. Implied to finally be happy courtesy of her grandmother at the episode's end.
- In the Blood: Maddie is a second-generation meteor freak, inheriting her powers from her father Tyler McKnight.
- If You Kill Him, You Will Be Just Like Him: She almost killed her father to save everyone else, but Clark talked her out of it.
- Mind over Matter: Glass, specifically.
- Power Incontinence: Has trouble controlling her powers.
- Self-Made Orphan: Believed to have killed her mom. Almost kills her dad, who is also her mother's real murderer.
Tyler Mc Knight
- Played by: Callum Keith Rennie
- Played by: Alexander Scarlis
- Shadow Archetype: There's a lot of Bruce Wayne in him—wealth and power, dubious connections, a talent for not being seen...
- Smug Super: Seriously underestimates Lex's ability to find him.
- Visible Invisibility: There's a distortion when he first disappears, but after that he's completely invisible, save when he bumps into something.
- Played by: Bryce Hodgson
- Anti-Villain: Type II. His victims really had it coming. Alden was thoroughly unrepentant and seemed to get a sick thrill from it, only wishing Duncan was there for further torment.
- Played by: Elias Toufexis
- Anti-Villain: Type III. All he wants to do is expose Lex and end the experimentation at 33.1.
- Jumping Off the Slippery Slope: Loses it when Lionel moves 33.1; he then attempts to kill Lex and Lana.
- Killed Off for Real: By Lex.
- Played by: Tori Spelling
- Alliterative Name: Linda Lake.
- Asshole Victim: So much so that it's difficult to judge Davis too harshly for killing her.
- Bullying a Dragon: What ultimately brings her down.
- Elemental Shapeshifter: Into water.
- Evil Cannot Comprehend Good: She seems to enjoy ruining people's lives; that or she doesn't give a damn about anyone but herself and her career.
- Evil Counterpart: Played as Lois', especially in her second appearance.
- For the Evulz: At least some of her actions are simply because she's a sadist who enjoys inflicting pain. She certainly seems to enjoy all of her misdeeds, though.
- Hoist By Her Own Petard: Tries to manipulate Davis into transforming and freeing her. Instead he turns and kills her.
- It's All About Me: She doesn't care about a single thing except for herself and is perfectly willing to destroy anyone's life for her own benefit.
- Killed Off for Real: By Davis in Season 8.
- Kryptonite Factor: Electric shocks force her back into human form.
- Meaningful Name / Punny Name: Linda Lake got her powers after her news van crashed into a lake in Smallville during the 2005 meteor shower.
- Played by: Greyston Holt
- Aura Vision: Sees normal people as red figures and meteor freaks as blue figures in a manner similar to infrared imaging.
- Blind Seer: Granted the ability to detect meteor freaks after being blinded.
- Disability Superpower: See above.
- Only Sane Man: One of the very few meteor freaks who hasn't gone crazy and/or homicidal. Although he really isn't in any condition to harm anyone, unless you count...
- Unwitting Instigator of Doom: Tricked into handing Chloe to Lex's secret lab where she is experimented on and painfully humiliated, and later almost killed.
- Played by: Anthony Shim
- Mind over Matter
- Only Sane Man: Exceedingly rare as he appears in the same episode with Tobias, making two sane meteor freaks in one episode. Three if counting Chloe. But then, Lex doesn't give him much time until his minions catch up with him in a "car accident." This may have something to do with this episode being directed by Michael Rosenbaum, Lex's actor, who always wanted Lex to be evil. Naturally, he would have to make meteor freaks more sympathetic to make Lex look bad. Also, it seems meteor freaks in general have becomes less psychotic after this episode.
- Played by: Juan Riedinger
- Played by: Richard Stroh
- Played by: Lindsay Bourne, Lynda Carter
- Played by: Tahmoh Penikett
- All Your Powers Combined: As mentioned by Lex.
- Barrier Warrior: Chloe mentions it took an equivalent of a mini-nuke to break the force field of an earlier prototype. Clark defeats him with a particularly vicious blast of heat vision.
- Died in Your Arms Tonight: He dies in Lois' arms.
- Dying as Yourself:
- Fighting from the Inside: With limited success.
- Invisibility: Both for himself and people he needs to be.
- My Country, Right or Wrong: But when Lex is involved, it is too much.
- Names to Run Away from Really Fast: Ares is the War God from Greek Mythology.
- You Look Familiar: Penikett had played a fairly minor character seasons earlier, who had died. Twice.
- Played by: Christine Chatelain
- Played by: Elisa King
- Played by: Eva Marcille
Bette San Souci/Plastique
Bette Sans Souci/Plastique
- Played by: Jessica Parker Kennedy
- Played by: Julia Maxwell
- Played by: Tyler Johnston
- The Sociopath: Bad even for meteor freak standards. He kills just to get famous.
- Played by: Anna Mae Routledge
- Played by: Brendan Fletcher
- Adaptational Badass: A mild version. He doesn't need skin contact to absorb powers and it is done in a second. He could also give them back and keep them longer.
- Played by: Jae Lee