Mona Lethal is a battle/fighting robot whom was a very popular robot for her design and strength. Robotboy fell in love with her for finding her attractive and when he heard that she was going to be on the Robo-Con he went there to see her. Then when he signed for the robot battles and won every single match he had to face towards her to fight with. At first he didn't fight to her because he liked her so much until he finally attacked her when she almost killed Tommy and Gus for stopping her from destroying Robotboy. And thus he defeated Mona while being superactivated.