Dr. K is a former scientist at RobixCorp and serves as the primary antagonist of the entire series, alongside with the Alien in the first season. His right arm is a cybernetic prosthetic which can transform into a Solex Extractor, as well as other tools.
His robotic minions include Kolossal/Scavenger, Krab, Klawber, Katastrophe and Kannon. In the season one finale, his entire base of operations turns into a massive robot, "Kulminator". In the second season, Dr. K created a robot called Kilobot/Demonix, which was able to steal data from other robots in his plot to take all of Cubix's EPU data.