|Home World||Earth (Rex's Universe)|
|Affiliations|| Providence (formerly)|
Providence Defect Group
|Powers and Abilities|
Curing other E.V.Os
|Equipment|| Nanite Machines|
|Relatives||Caesar Salazar (brother)|
|Alias|| Robot Boy (Rath and Kevin)|
Machine Boy (Ben)
|Voice Actor||Daryl Sabara|
|First Appearance||Ben 10-Generator Rex: Heroes United|
Rex Salazar is a young EVO with the ability to cure other EVOs, including the ability to control his nanites using the Omega-1 Nanite. He can grow weapons and machines from his body, often using his limbs, and can communicate with technology, machines and even with nanites themselves.
Rex is Hispanic, being half-Mexican and half-Argentinian. He is most normally seen with lightly spiked, slicked back dark hair. He is also taller than most people his age. Rex also wears a pair of orange googles on top of his head, with a matching red-orange patterned jacket. His T-shirt is blue on the top-half and white on the bottom-half, with two orange rectangles on the left pectoral. Rex wears black pants with blue geometrical patterns which glow whitish blue whenever Rex uses his powers. He also wears blue gloves with orange cuffs and blue-black shoes.
Not much is known about Rex's life before the Nanite Event  except finding out his parents and older brother were scientists and he was the first human subjected to the nanites.
Ben 10-Generator Rex: Heroes United
In the crossover special, Ben enters Rex's world by accident, and Rex confuses Ben for a dangerous EVO After Rex and Ben have a fight, they eventually team up to face the worst threat either of them have ever faced: the sapient nanite Alpha. A creature that has to suck the nanites from EVOs in order to survive, Alpha had previously been banished to what was believed to be a dimension of nothingness - however, Ben explained that the villain had ended up in the Null Void, where he managed to feed on various alien prisoners until he could escape.
Rex and Ben eventually confronted Alpha inside the Bug Jar, where it absorbs Rex's Omega-1 Nanite in an effort to create a body to sustain itself. In response, Ben used Upgrade to increase Rex's power - together, they were able to do enough damage to Alpha that Rex was able to trap him in a super-concentrated ball of Nanites, which Ben dumped into the Null Void on his way back to his universe.
Hero Times Two
Rex arrived in Ben's Universe with Bobo to hunt the Pack, and to obtain the Promethium. He encounters Ben and the team and he needs help. He forms a rivalry with Kevin. He failed to defeat the Pack and he was sent back to his own universe with the help of a portal created by Gwen.
Powers and Abilities
Like all living things on his Earth dimension, Rex has billions of nanites inside his body. After activation, their nanites mutate a normal being into an EVO. However, unlike most EVOs, Rex has the ability to control his nanites at will, allowing him to build various machines on his body. He can also use his nanites to communicate with a variety of machines and cure some EVOs of their mutations.
|The B.F.S (Big Fat Sword)||Is a big sharp sword, Rex can build this on either arm with a secondary mode in which it's used as a buzzsaw. It is very durable.|
|Smack Hands||Are two giant gauntlets that Rex builds on both of his arms. The have a secondary function in which Rex spins them like drills to either add extra power to his punches or tunnel through solid rock.|
|Slam Cannon||Is a large handed cannon that Rex builds on either arm. It grabs ammo from the ground and shoots it out.|
|Punk Busters||The Punk Busters are super boots that Rex builds out of his feet. He can jump very high in them. He can even use them to kick foes really hard.|
|Boogie Pack||The Boogie Pack is a jet pack with a pair of large turbine wings. The two gray turbines can be shot out like bolas and reeled back in.|
|Rex Ride||A motorcycle that uses levitation instead of wheels with a built-in battering ram. Rex can ride very fast on it.|
|Blast Caster||Is a mechanical tentacle, with a nanite generator in his back, the tentacle is extendable to a great length and can be used to shock his opponents.|
|Funchucks||The Funchucks are giant nunchucks that are attached to both of Rex's arms. He can spin them at high speeds launch them at his enemies or use them to generate an energy pulse.|
|Bad Axes||The Bad Axes are a pair of large blue axes that can slice through almost anything. The sharp edges are a light, glowing blue.|
|Block Party||The Block Party are a pair of shields built around Rex's lower arms and hands. They are made up of super-charged atoms that can block almost anything.|
|Upgrade Suit||The Upgrade Suit is the form that Rex takes by merging with Ben Tennyson in his Upgrade form. It is powered by alien technology. With the upgrade suit Rex's builds are enhanced to levels far beyond anything on Earth; providing very advanced weaponry that includes faster flight, speed and greater strength—all with the help of Ben Tennyson.|
- Rex Salazar (the article on the Generator Rex Wiki)