Alliance

After stopping another Rabbit E.V.O., Rex begins to suspect something is wrong with Bobo when he begins acting nice and even helping out around Providence. But when Rex tries to convince Six and Holiday, both tell him that he shouldn't worry, and Holiday even explains that Bobo had a troubled past involving a children's hospital and a man in a purple suit. Rex takes things into his own hands and throws a party, but when Bobo declines (and even escorts a showgirl called in by Rex), Rex attacks Bobo, knocking his head off in the process and discovering that "Bobo" is really a robot. The robot reveals a screen in its rear, displaying the real Bobo who explains to Rex that he needed some "Bobo Time", and then requests that Rex not do anything to draw further suspicion on him or the robot. Rex however decides that the robot Bobo needs to be more like the real Bobo and uses his powers to change him. The noted aspect of Rex's changes is his saying 'good is bad, and bad is good', which the Robot Bobo begins to take quite literally. While studying the pink rabbit E.V.O. from earlier in the petting zoo, Holiday discovers it is pregnant and about to have babies. Unfortunately the mother rabbit spawns a lot of offspring, which begin to wreak havoc in the petting zoo. Rex, Holiday, and Six race to capture them but Robot Bobo, remembering Rex's saying, goes wild and attempts to release the native E.V.O.s, proclaiming it the "ultimate prank". The real Bobo shows up in time before the E.V.O.s can escape and attacks Robo Bobo.

Six and Holiday succeed in capturing the bunnies, while Rex battles the mother bunny which is acting very defensive around him. Six and Holiday get it to calm down and Bobo finishes off his robot double. When questioned by Six, Bobo quickly create an alibi about being kidnapped and replaced by the robot by the same man in a purple suit, and Six appears to buy it. Later on in Rex's room, Rex attempts to find out more about Bobo's past, who spins a similar tale like the one Holiday told him, about the man in the suit and the hospital, and claims that he was visiting his family. But Rex is doubtful and begins to chase Bobo as the episode ends.

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.