Roller is one of the many types of Badniks created by Dr. Eggman and appears as an enemy in Sonic the Hedgehog on the Sega Mega Drive. Based on an armadillo, the Roller has a tougher body than most Badniks of its generation. It attacks Sonic by curling into a ball and rolling down slopes, attacking Sonic from behind. It is only vulnerable when it uncurls and stands still.