Dum-E is a hydraulic arm robot Tony Stark used as assistant in his workshop. He made Dum-E in his father's workshop. While Dum-E is generally used to help with Stark's creations, U is used to do the registration of Stark's work using a video camera. Despite Stark's irritation at the robots, they have saved his life on more than one occasion. Dum-E and U helped make some of Stark's armors.