Ben tracks Zs'Skayr to the Chicago Lake Front, where the latter reveals that he has used the crystals to supercharge three of his minions to fight Ben. At the Plumber base of Mount Rushmore, Zs'Skayr steals the Ethereal Amplifier for Vilgax. After beating Hex, it is revealed that he was actually possessed by Zs'Skayr. While fighting them, they encounter Hex, who plans on taking over the Earth by opening a portal from Earth to Anur Phaetos, Zs'Skayr's home planet, (the source of the minions) to create an army. While camping at the Effigy Mounds, Ben, Gwen, and Max are attacked by Zs'Skayr's minions. It is revealed that Zs'Skayr has freed Vilgax from the Null Void and has teamed up with him to get revenge on Ben. Grandpa Max begins putting together clues taken from the past battles and realizes that Vilgax is behind it all.

After beating the mother plant, Snap Dragon, it expels a third crystal and Ben regains Wildvine. Meanwhile, the Tennysons now focus on fighting the plant monsters Kevin brought back with him, tracking them to the top of the Seattle Space Needle.

After defeating him, Kevin is sucked back into the Null Void. Kevin kidnaps Grandpa Max, and Ben and Gwen track him to a lumber mill. But Kevin brought some plant-like aliens with him (apparently from Wildvine's homeworld) and they begin joining the rampage as well. While heading to San Francisco for a real vacation, Kevin 11 shows up from a Null Void portal on the Golden Gate Bridge, and begins going on a rampage with Ben tracking him down. After defeating Enoch, his robot expels another crystal and Ben regains Cannonbolt from it. The Tennysons track Enoch to the Hoover Dam and fight him and his robot. At Area 51, Ben fights Enoch, but he escapes with a giant robot made in his own image, using technology from the base. After fighting the Forever Knights at the Mesa Verde, one of them tells the Tennysons that Enoch is using technology from Area 51 to stop a dangerous threat.

The Tennysons see that Vilgax's drones and the Forever Knights are fighting each other. After fighting most of the robots, Ben fights a giant robot, and after defeating it, it expels a crystal (referred to as Omnitrix Crystals) and by absorbing it into the Omnitrix, he is now able to change into XLR8. Strangely, Ben can only change into Four Arms and Heatblast. Ben wakes up to see a large object crashing into the Grand Canyon, and Drones are rampaging in the Grand Canyon. While sleeping near the Grand Canyon, a mosquito-like drone begins absorbing DNA from Ben's Omnitrix.

Ben 10 protector of earth platforms