Rotox 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. In the season finale episode of Power Rangers Megaforce "End Game (Megaforce)" three robotic clones of Rotox, the Water Rotoxs, serves as the final monsters for that season.