A friend of Matoran Vakama, and the Av-Matoran Takua, whom Jaller helped to keep out of trouble from the Vahki. When the body of the Ta-Matoran murdered by Tuyet was found, Dume instructed Jaller to investigate the incident. Just prior to the Great Cataclysm, Jaller was captured by the Vahki and placed in a Matoran Sphere, under the orders of Makuta Teridax, disguised as Turaga Dume. He was later rescued by the Toa Metru and brought to Mata Nui.