Later, she quarrels with other members and gets trapped in the force field where the Sub Energy was kept. In the battle, she interferes with Gwen and Charmcaster's duel, but gets blasted away by Charmcaster and Gwen's combined spell power. She has developed a rivalry with Charmcaster over being the "baddest girl" in the group. the Negative 10, Rojo was part of the Negative 10, with new alien tech and armor.
Later on Rojo rampaged down at the local police academy in order to draw Ben out, but got turned back to normal when Upgrade merged with her, took over her body and shorted-out the spare parts, after which Gwen knocks her unconscious for attempting a sneak attack on Upgrade. Rojo goes after Ben at the hospital where Max is staying, where she causes a landslide to lure him out, which Heatblast stops and defeats her.
Rojo goes on a crime spree before being contacted by Vilgax, whom demands that she serve him, threatening to destroy her should she refuse or fail him. The remnants of one of Vilgax's defeated drones merges with Rojo as she investigates it, turning her into a cyborg. Heroes meets back up with Gwen and Kevin, and they learn that Max has gone to Encephalonus IV, Brainstorm's home planet, where an old enemy of Heroes is waiting for him.Rojo first appeared in The Alliance, where she, and two other criminals tried to rob an armored truck, she was thwarted by Four Arms and two of Vilgax's drones coming after him while Azul and Amarillo ran away. Ultimately, Charmcaster is defeated, Heroes destroys the energy core, and the temple begins to crumble. Heroes gets Goop back and inside the temple, he ends up facing Charmcaster, who wants revenge on Heroes for his actions against her Uncle Hex. The group arrives at Terradino and learns that the next energy core is located in a nearby temple. In another message, Maxs directs the team to Terradino, which is Humungousaur's home planet. He reunites with his teammates, who learn of Vilgax's plan: find an energy core to energize his Null Void projector and use it to take over Earth. When he reaches the refinery, he encounters the Vreedle Brothers (Octagon and Rhomboid Vreedle) and defeats them, and destroys the alien tech, setting fire to the refinery in the process. Heroes heads off to the refinery alone along the way, he battles several of Vilgax's robots, some Vulpimancers, and a giant two-headed snake. On Vulpin, another message from Grandpa Max reveals that Vilgax is using the planet's refinery to create a piece of alien tech for an unknown purpose. Ben Alien Force Vilgax Attacks Fight calls upon the Galvanic Mechomorph Ship to aid them. Paradox gives the trio a message from Grandpa Max, who directs them to the planet Vulpin, home of Wildmutt, one of Heroes original aliens. Gwen and Kevin show up, along with Professor Paradox, who teleports the gang back to the past to stop Vilgax's plan before it happens. Azmuth, creator of the Omnitrix, appears and tells him that the Omnitrix must recharge before he'll have access to all of his aliens again, leaving Heroes with only Swampfire, Humungousaur, Cannonbolt, Big Chill, and Spidermonkey. Heroes ends up using most of his Omnitrix aliens to defeat it, but ends up draining the watch's power as a result. Splitting up, Ben battles Vilgax's servant Psyphon, who brings a Mr. When Vilgax invades the Earth using a Null Void projector (which beams Null Void prisoners to Earth), Ben, Gwen, and Kevin, snap into action to defend their hometown Bellwood from the attacks.