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ZAG-RS

Voiced by: Grey DeLisle
A rogue AI based in space.
- A.I. Is a Crapshoot: Was created by Caesar to contain any rogue Nanites, now wants to destroy the world as a result.
- Big "NO!": First appearance in episode 5.
- Does This Remind You of Anything?
- Gone Horribly Right: It was created to contain any rogue Nanites and because all living creatures have rogue nanites inside them so ...
- Kill 'Em All: Anything with nanites, at least.
- Kill All Humans: Which is almost every living thing on the planet in the series.
- Manipulative Bitch: She's very good at getting humans to do what she wants, first tricking an entire colony of people into helping her build a Doomsday Device and in her second appearence hiding out in their robot buddy until they'd done everything she needed them to do.
- Not Quite Dead: Even if it showed up out of pretty much nowhere, this was pulled quite nicely in Gravity. Twice!
- Omnicidal Maniac: Has absolutely no problem killing all life on Earth (well except White Knight, who is uninfected) just to protect herself.
No-Face

"They are the before. The before forgot us. The before left us here. Left us in pain,"
Voiced by: Fred Tatasciore
- Alas, Poor Villain: In the beginning, all he wanted was to get out of the area in which he was imprisoned, unfortunately his plan to escape fails due to Rex's interference, causing sadness and depression to him.
- Authority Equals Asskicking: His debut episode was one thing. When next he shows up, he takes on Rex and the Pack (separately) and was easily a better fighter than all of them. He's not an Evo to be taken lightly.
- Bare-Fisted Monk: Aside from his ability to communicate with other Evos, he lacks any of the powers or advanced technologies employed by other villains. He still manages to be an extremely dangerous opponent by combining his EVO physicals with a vicious and highly coordinated fighting style.
- Character Development: in his third appearance he learned how to become more pragmatic as a result of what happend in his second appearance.
- Diminishing Villain Threat: Despite those victories, in his third appearance, his skill has considerably diminished, Rex could beat him easily, and he only got a few good hits in, it might have been to show how good Rex has become as a fighter, but No-Face still put up a pitiful fight, and went down easily. In addition, when Cain said that he would kill Rex, No-Face did nothing about it, this clashes with his second appearance, where he went ballistic when Van Kleiss attempted to stop his vengeance against Rex! Though its possible he learned from that encounter and became more pragmatic as a result.
- The Faceless: Until he got cured in the finale.
- Hair-Trigger Temper: Quickly loses it when someone gets between him and something he wants, be it revenge or freedom from the Bug Jar.
- Jerkass Has a Point: While No-Face may be an insane mutant bent on making humanity suffer, this isn't entirely unreasonable given his previous treatment by humanity. Considering that humanity abandoned him in the chaos of a collapsing city and trapped him in the ruins with no way of getting out, his attitude and mental instabilities are somewhat understandable.
- Mission Control: Coordinates the other Evos in the Bug Jar to make them more effective.
- Multi-Armed and Dangerous: He has four arms.
- Sealed Evil in a Can: He's trapped inside the Bug Jar. And he wants out!
- Villain Team-Up: Van Kleiss tries to orchestrate one with him. It fails. Happens again in "Enemies Mine", which worked better since all involved wanted Rex dead. Not that they succeeded, of course.
- Telepathy: How he controls the other Evos.
Hunter Cain

Voiced by: John Cena (debut), John DiMaggio
Hunter Cain is a vigilante who strongly dislikes EV Os and is one of Rex's enemies. Attempting to give Rex a bad reputation, Cain was exposed for cloning EV Os to build his own image to his followers. Since then, he made Rex a permanent target for his revenge, being labeled a nemesis of Rex.- Bald of Evil: With a scar on the top.
- Enemy Mine: The aptly named "Enemies Mine" has him working with other enemies of Rex. However, he turns on them at one point when it looks like he could kill Rex himself.
- Fantastic Racism: Hates all Evos after his own wife transformed into one.
- Hypocrite: Despite making it his goal to destroy EVOs, near the end of his debut episode, he admits that he created the ones that his men and Rex were currently fighting to discredit Rex and prove he was better. He also teams up with No-Face in a later episode, which Rex immediately calls him on. There's also his lack of regard for any non-Evo who gets in his way.
- I Call It "Vera": His BFG, Sweet Caroline. It's presumably named after his wife who turned EVO.
- Name of Cain: Although it's never stated how to spell it.
- It's Personal: His grudge against Rex and all other Evos.
- Kill 'Em All: His overall goal is to kill off all Evos.
- Not-So-Well-Intentioned Extremist: Wants people to see him as the hero, but it's clear he's a just a man consumed by hatred and paranoia looking for an excuse to hurt others.
- Shout-Out: He physically resembles Jason Voorhees.
- Spell My Name with an "S": How are we supposed to spell his name, exactly? note
- Villain with Good Publicity: Very popular as shown in his debut episode until he's exposed for creating EVOs to gain said publicity.
- Would Hurt a Child: Especially if that child is an EVO.
Peter Meechum

Voiced by: Wil Wheaton
Dr.Peter Meechum is the father of Sarah Meechum and a scientist involved with the Nanite Project. Once an EVO, Peter had the power to "zombify" people that came in contact with him by a simple touch. He let himself be cured after Rex promised he'd rescue his daughter from Van Kleiss. He later reappeared as a scientist for Providence and Black Knight to resume the Nanite Project.- People Puppets: Peter Meechum, as an E.V.O, can activate the Nanites in anyone he touches, granting him control of their muscles, but not their minds. The one guy Providence captured who had been affected, though, was a remarkably good sport about it. The rest just keep quiet.
Gabriel Rylander

Voiced by: Brent Spiner
Dr. Gabriel Rylander was an evolutionary biologist and a leading expert in nanotechnology. He later worked on the Nanite Project along with other scientists before the Nanite Event.- His Name Is...: Rylander is impaled by Van Kleiss before he can spill Rex's backstory. While this doesn't kill Rylander, the effect is the same. What makes the use of this trope especially blatant is that Rex had just called him out for being so cryptic, and Rylander had apologized for it, realizing how long Rex had been desperately trying to find the answers, just in time for Van Kleiss to show up.
- I Did What I Hadto Do: he and the other scientists who were working on the nanite project are always saying that.
- Meaningful Name: Gabriel Rylander and Rafael Salazar, the two leading scientists on the nanite project, share their names with two archangels.
- Mecha-Mooks: Rylander uses these to defend his base in his first appearance.
Claire Bowman and Annie

Claire

Annie
Voiced by: Danica McKellar (Claire), Felicia Day (Annie)
A pair of "normal" teenage girls that go on double dates with Rex and Noah. They're both scientific prodigies and Annie has notoriously dangerous bad luck. So bad that Noah recruited Rex to go out with her because he didn't think anybody else could survive the experience.
- Actor Allusion:
- In "Operation: Wingman". Noah, who is played by Fred Savage, goes to prom with Claire, voiced by Danica McKellar, who is well-known for playing Savage's love interest Winnie Cooper in The Wonder Years
- Badass Normal: They do not have supernatural abilities, if you do not consider annie's instantaneous bad luck as an Super Power, yet they are able to act badass while facing very strong enemies.
- Born Unlucky: To supernatural degrees.
- Color-Coded for Your Convenience
- Cute Clumsy Girl: Annie, to the point where every guy that goes on a date with her ends up in the hospital.
- Genius Ditz: Claire and Annie are geniuses in science, physics, mathematics, and psychology
- Girls Are Really Scared of Horror Movies: While watching a horror movie, Claire and Annie are very afraid of the movie, and both girls hold onto Rex during one of the scary moments.
- Hot Scientist : Annie and Claire are pageants in science, mathematics, and psychology, and they are without a doubt cute girls and kind of hot.
- The Jinx: Annie is also known as "the blonde widow" for this reason and has used this trait as a weapon on occasion.
- Lethal Klutz: Every normal boy who has gone on a date with Annie has ended up in hospital. It is speculated that second date would kill them.
- Teen Genius
- True Companions: The episode "Hermanos" reveals that Rex feels this way towards Noah, Annie and Claire
- Those Two Girls
- Walking Disaster Area: Annie seems to be this for any boy that dates her.
- Why Did It Have to Be Snakes?: Claire's claustrophobia.
- Why Are You Looking at Me Like That?
- Wasn't That Fun?
- Wrench Wench: Annie and Claire do a lot of male chores like digging, driving a tank, shooting and farming.
Gatlocke

Allow me to introduce myself. I'm Gatlocke. Anarchist, struggling businessman, scoundrel... Okay, that's a lie, I'm not struggling, but let me ask you. Do you like rules? [...] Me neither.
Voiced by: Greg Ellis
- Affably Evil: Is surprisingly polite to his enemies even in battle.
- Arm Cannon
- Berserk Button: Do not call him "common."
- Blade Below the Shoulder
- Card-Carrying Villain: He is unabashedly this, and readily admits it.
- Comedic Relief Characters
- Cloudcuckoolander: he is incredibly insane
- —>Rex: You are insane .
Gatlocke: Me Gatlocke insane Frankly I do not see it - Evil Brit: Speaks with a clearly British accent.
- Equal-Opportunity Evil: There are no ladies in his gang. He thinks something needs to be done about that.
- Psychopathic Manchild: he acts like one.
- Large Ham: Oh god, is this guy chewing the scenery... In fairness, he does seem to be aware of his hamminess, and enjoys it quite a bit, sort of like an in-universe example of Ham and Cheese...
- Laughably Evil: he is hilarious That for sure.
- "Not So Different" Remark:Rex: I've got the unstable nanites right here! Back off or I'll send us all to Kingdom Come!Gatlocke: You wouldn't dare!Rex: Or would I? You said you and I are a lot alike...Gatlocke: You would.
- Not-So-Harmless Villain: The punk on the first sight who is actually a very dangerous if you pish him too hard.
- Pirate: Desert variant, though he wonders if the spyglass is too cliche.
- Ironically, his voice actor portrays a non-pirate character in a famous movie series about pirates...
- Remembered I Could Fly
- Seinfeldian Conversation Gatlocke enjoys side conversations that for sure.
- Un Evil Laugh: He has a wicked sarcastic laugh
- We Sell Everything: From the Nanite trade to toilet tissues.
- Wolverine Claws
- You Talk Too Much!:Rex: can you stop talking for longer than a second !Gatlocke: How Long Was that.
Branden Moses

Voiced by: Nolan North
A famous scientist whos seemingly discovered a cure for all EVOs. In reality, hes a fraud who sells his EVO patients as Super Soldiers to the highest bidder.
- The Antichrist: Well, more like "The Anti-Moses", but same basic principle. Pretends to want to cure EVOs (supposedly freeing them of their condition, so to speak), but instead enslaves them. (the opposite that the the Biblical Moses wanted and trietried to do, which was to free slaves).
- Auction of Evil: Runs one where he sells incurable EVOs as Super Soldiers.
- Bitch in Sheep's Clothing: Promises a cure, but it turns out to be a scam.
- Faux Affably Evil: Pretends to be nice....until his true colors are revealed.
- Ironic Name: His last name is Moses....yet he enslaves others.
- Superhuman Trafficking: He auctions off his patients as One Man Armies to various criminals.
Quarry

"Let me just say I abhor unnecessary violence. But this... is veeeeery necessary."
An EVO crime lord who Rex used to work for, prior to losing his memories.Voiced by: Mark Hamill
- And I Must Scream: Even shattering him apparently doesn't kill him. It does make any sort of communication rather difficult, though.
- Detachment Combat: In his third appearance, he can use his fist like a whip. This is apparently because of the injuries Van Kleiss inflicted on him.
- Faux Affably Evil: He puts up a friendly act, but hes a ruthless manipulator whose only out for himself.
- Literally Shattered Lives: It's all but stated outright that Van Kleiss punished him for his betrayal by breaking his body apart. His new outfit is apparently the only thing holding him together. Taken a step further when Rex hits him with his spinning giant fist, outright shattering him into chunks
- Smug Snake: He is extremely arrogant and smug.
- Taken for Granite: His mutation turned him into living stone.
John Scarecrow

"You're your own worst enemy".
Voiced by: Andy Milder
John Scarecrow is a shape-shifting EVO who had conflicts with Rex's old gang and personal problems with Rex Salazar himself. He made an alliance with Black Knight and returned to get revenge on Rex by successfully infiltrating The Plant.
- A House Divided: Part of his Shapeshifter Guilt Trip Tactics. It succeeds.
- Chekhov's Gunman: See Foreshadowing.
- Evil Is Petty: He actually succeeded in his mission of sending the data on the meta-nanites to Providence early on. The rest of his interactions with Rex and Co. was just for the sake of messing with Rex's head.
- Lean and Mean: Having the appearance of a scarecrow, this isn't surprising.
- Shapeshifter Guilt Trip: Loves to sprinkle this into his "The Reason You Suck" Speeches.
- Voluntary Shapeshifting: His main EVO ability.