Great Heep
a huge droid created by the Empire to mine fuel ores on the planet Biitu. After it was discovered that Mungo Baobab had begun refining fuel on Biitu, the Empire sent Admiral Screed and the Great Heep to capture him and take control of his refineries. In this, the Great heep was successful. The massive droid consumed everything in its path, and was equipped with numerous repair droids. It was eventually defeated by the droids C-3PO and R2-D2, shortly before the Battle of Yavin, when they attempted to rescue Mungo with the help of the young boy named Fidge. They managed to rescue Mungo and destroy the Great Heep, liberating Biitu from Imperial control.