Rennia Botblast is an extremely rich and famous iguanodon inventor who specializes in robots (she has invented more than two hundred kinds), and is a heroine of Arx. She designed an automatic city on Metka, a moon on Iguanos once used as a dung dumping ground, run from a Central Skyscraper by Rennia herself and her Main Computer. However, the Metka project hit trouble when the mysterious "Metal-Master" told Wimvis, an iguanodon builder, that robots would take over his job. After many failed attempts to contact Rennia, the upset Wimvis and his crew came to Metka personally to confront her. At the same time robots began to disappear, causing Rennia to call the DSS to ask for help.