Due to an Irken mishap, ZIM receives a cool stealth robot with which he will ruin Dib once and for all. But ZIM doesn't quite understand that just because the robot is invisible doesn't mean he is. / When an outbreak of lice hits the Skool, an intense woman known as the Delouser arrives to rid the children of the infestation. Dib naturally suspects the woman as having ulterior motives.