Rotox (voiced by Mark Wright) is the first mechanical opponent faced by the Mega Rangers and the primary antagonist of the episode "The Human Factor". He is a prototype who is sent out to analyze the Rangers' strengths and weaknesses, for Vrak intends to defeat humanity through the Robots without making the same mistakes as the Insectoids and Toxic Mutants before them. As the first of a line created to demonstrate the superior strength and endurance of robots, Rotox is tough and confident in his abilities. He follows his assignments to the letter and has a taste for extreme destruction. Also he is very enthusiastic when it comes to fighting, with his catchphrase being "Ready for Action!".