Van Kleiss

Van Kleiss (voiced by Troy Baker) is the main villian of the series. He is described as "every mad scientist you ever saw, only a lot freakier and dangerous." Like Rex, he can control his nanites, but as his mutation is unstable, he has to absorb nanites from other Evos to sustain himself. His victims are petrified in the process. He controls a group of powerful Evos known as the Pack. He has established a domain called Abysus at the original site of the nanite explosion, and has nanites seeded for miles in the area around his headquarters in a ruined castle. As a result, he can control everything in his sphere of influence, and even regenerate completely from the ground if his body is destroyed. He knows a great deal about the nanites, apparently having worked on or been familiar with the experiment which released them, and about Rex's past. As of right now, he was Eliminated..... but brought back when his abscence made abyses's nanites go beserk. however the process of bringing him back to life reset his nanites making him cureable. rex cured him when e realised this and van kleiss proclamed he still had his intilect before being saved by the pack.

Trivia

It's widely speculated and possible that Van Kleiss may in fact be Rex's long lost brother. They share many resemblances with each other. They have similar hair color, eye color, they both have similar control over nanites by taking in others, though they differ in effect. Rex's powers cure EVO's while Van Kleiss's are needed to keep him alive and seemingly kills its victims.

Maybe there is a real reason why VanKleiss always wants Rex to join him ,because he might be Rex' long lost

older brother.