Payback

While Providence HQ is being rebuilt since Payback, Rex and Bobo are living with (and annoying) Noah, while Six is a "ninja-hobo" in his jump jet. Rex gets a call that Providence is trying to transport a power core, when an E.V.O. goes on the loose, and conveniently, is near the power core. Rex later finds out that Van Kleiss used him as a decoy to detract attention from the power core. After a battle between Rex and Van Kleiss, the latter turns Noah into an E.V.O. (a giant blond E.V.O. dog), forcing Rex to try and cure him before Providence hurts his friend while chasing all over the city and into a sewer. Dr. Holiday did research on a sample she took from the earlier E.V.O and reveals that the E.V.O.s created by Van Kleiss may become permanent, if not cured within a certain amount of time (she assumes, at this point, that the time period is different for each E.V.O.). Rex's biometrics drops, causing him to take a breather before curing Noah. Van Kleiss scares Noah away before Rex can cure him. After a chase in a labyrinth of train tracks, Rex's biometrics spike back up, and a new build of his allows him to defeat Van Kleiss, with a little help from Noah. After Rex finally cures his friend, it is revealed that turning Noah into an E.V.O. was actually a distraction as pulling out Rex, Six, and Bobo crippled the defenses of the power core, allowing Breach to steal it and recover Van Kleiss. Back at HQ, Rex is training, trying to create more builds (including a Water-Jet), after deciding that he wants to stay back "home" in Providence, with Six and Holiday feeling the same way.

Rex, Agent Six, Noah, Dr. Holiday, Bobo Haha, White Knight, Van Kleiss, Biowulf, Breach, Skalamander, Providence Cadet Kenwyn Jones

Rex is 15, and like most 15-year-old boys, he likes cars, girls, music and sports. But unlike most 15-year-old boys, he can make his fists the size of boulders, sprout a jet pack out of his back and turn his legs into a lightning-fast motorcycle. These talents are extremely useful to Providence, a global organization chartered to fight mutant creatures known as E.V.O.s (Exponentially Variegated Organism). Rex is under their care and is their ultimate weapon.

Generator Rex takes place in the aftermath of a global accident, where microscopic machines known as nanites have merged with every living thing. For a select few, the nanites mutate their hosts into monstrous creatures called E.V.O.s.

Rex is one such E.V.O., but unlike the monsters he and Providence battle, Rex has control over his nanites. He alone has the ability to not only control these nanites- allowing him to create amazing mechanical limbs and gadgets that aid him in battle ' but also heal E.V.O.s of their mutation.

Rex's powers are incredible, and his importance to Providence and the world is undisputed. But on top of that, he just wants to be a normal teenager and must balance his adrenaline-fueled adventures with the everyday ups and downs of being 15. Rex is joined by a team of characters including his sidekick, a highly intelligent monkey named Bobo Haha who encourages Rex's mischievous side; his mentor Agent Six, so called for being the world's sixth deadliest man; the brilliant Dr. Holiday, who seems to be the only one that really understands Rex; and Noah, a regular kid and Rex's friend.

Rex's greatest threat is an E.V.O. named Van Kleiss, who with his minions called The Pack sees the nanites and resulting E.V.O.s as part of a greater plan and the future of humanity.