A terrible mine collapse uncovers the secrets of the mysterious Lan-Di Civilisation. The clever Lan-Di robots are packed with advanced technology, but why do they obey Super Brainz? Banished to a remote island, the Plants must work day and night to grow Energy Grass. What special power does this magical grass hold?   Can the Plants team up with Dr Zomboss to defeat Super Brainz and the fearsome Lan-Di Battle Drones?