Mandrel worked in Megropolis One's Main Control until he turned outlaw and fled into the undercity. There he led a band of outlaws. They only ventured into the city for essential tasks, such as collecting food. The Fourth Doctor, Leela and Cordo arrived in the undercity and Mandrel tasked the Doctor and Cordo with taking a consumcard to the Consum Bank on subway 37, keeping Leela as a hostage. Mandrel told the Doctor that he had to return before a set time or he would kill Leela.