After being injected with the specialized Omega Nanite, he gains the ability to create stronger and more effective machinery with unique properties.
named Circe, who originally worked for Van Kleiss, but defected after realizing that he desired Rex "alive" in body only.
He claims that before he was turned into an E.V.O., he was a helper animal trained to entertain children at a hospital, whose owner was an eccentric philanthropist.
She also harbors a crush on Six, which he grows to reciprocate in "A Family Holiday" and starts to recall in "Riddle of the Sphinx" after losing his memories in "Six Minus Six."
In the five years after the Event, he had short pale brown hair and was a skilled agent for Providence working under Dr. Fell as well as Six's closest partner.
Van Kleiss is the primary antagonist of the show, a British scientist who specializes in biointerface and biomechanical integration.
He expresses insanity to mask his evil and ambitious nature until he can fulfill his goal of absorbing the five Meta Nanites to attain godly abilities.
In the past, he was responsible for the deaths of Cesar and Rex's parents, Rafael and Violetta, by trapping them inside as the nanite reactor exploded.
He saw the Nanite Event as the dawn of a new golden age for evolved humankind, and seeks to create a planet populated by E.V.O.s.
called G'raan Set in a makeshift laboratory, then preserved himself in a hibernation chamber that stored his unstable nanites and ensured he was able to survive to the present.
Owing to Van Kleiss' powers being limited to his native soil in early episodes, he initially acts as the Pack's de facto leader in the field.
His final appearance is in "Remote Control", where Van Kleiss mind-controls Sqwydd, Tuck and Cricket to attack Rex.
He eventually makes his second and final appearance in "Enemies Mine", where he tries to take out Rex once and for all by teaming up with Hunter Cain, NoFace and Valve.
Their fates are unknown since they were trapped inside a shield made by Rex's surplus nanites at the Purgatory Base.
After taking over Providence, she starts to run things differently from how White Knight had, as she believes in controlling the incurable E.V.O.s rather than trying to cure them.
He makes his second and final appearance in "Enemies Mine", where he tries to take out Rex once and for all by aligning himself with Hunter Cain, NoFace and Gatlocke.
Their fates are unknown since they were trapped inside a shield made by Rex's surplus nanites at the Purgatory Base.
In six years, they managed to merge with four of the five Meta Nanites, turning into biomechanical robots with powers such as teleportation, pyrokinesis, cryokinesis, and electromagnetic-controlling abilities.
When merged with a Meta-Nanite, he was transformed into a tall and thin robotic E.V.O with green armor and the ability to manipulate time and space.
But after this plan failed, he tried to use organic beings as hosts, resulting in Ben entering the world of Generator Rex and causing the events of Heroes United.
He is ultimately taken back to the Null Void by Ben Tennyson (in the form of Upchuck) and escapes his metallic prison as the Omega Nanite is re-injected inside Rex.
Using her larger arms, Breach can tear open space and time, creating red wormholes which turn golden after her spatial abilities were boosted by Van Kleiss' amp pack.
She is nearly swept away by the unstable nanite goop, but after being saved and regaining consciousness in Rex's arms, she says that she is happy to see him.
Her second and final mission with the Pack is in the Bug Jar when she discovers, to her horror, that Van Kleiss is more interested in what Rex's body would give him and does not care about what could happen to his psyche.
Guy", she goes on another date with Noah while he and Rex were going all-out on a prank war that ended up endangering the entire city when Bobo Haha got involved.
At the end of "Hermanos", Rex states that she, Claire, and Noah are his true companions and he considers them as his family as much as Six, Bobo and Dr. Holiday are.
It is later revealed that when he was younger, Rex was the gang's leader before he lost his memory and joined Providence after Agent Six found him.
Big Chill is a Necrofriggian, an asexual humanoid moth-like alien whose wings and antenna can fold up into a hooded robe.
Upgrade is a Galvanic Mechamorph, a humanoid alien with black skin and green mechanical prints throughout his body.
Kevin Levin is Ben's friend, a reformed criminal with the ability to absorb the properties of matter, energy, and DNA through touch.