Xamus/Sumax

Xamus/Sumax was a two-headed, four-armed sentient who was imprisoned on M'Bardi during the Clone Wars. He was possessed of two distinct personalities, one for each of his heads: one head was a peaceful, gentle being, and the other violent and angry. Though they were not unaccustomed to working together, the heads—each of whom controlled one pair of their body's arms—had vastly different attitudes and views on life. Eventually, Xamus/Sumax ended up in M'Bardi Prison, on the water planet M'Bardi in the Outer Rim.

During the Clone Wars, the Separatist commander Durge started a mass brawl and riot in the prison, which caused damage to the building and allowed water to enter it. Xamus/Sumax was involved in the rioting, though he soon came up against a pair of Jedi Masters, Kit Fisto and Plo Koon, dispatched to M'Bardi to put a stop to the riot. After being incapacitated by Fisto, both of the heads worked together to stop Durge from killing the Jedi, in the interest of their own preservation. Fisto and Koon allowed Xamus/Sumax to follow them onto the higher level of the prison, and after another clash with Durge, Fisto allowed him to tag along with the Jedi and watch their back, for which Xamus/Sumax would be rewarded with freedom.

Text and facts from the “Xamus/Sumax” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.