Xoon is one of the villains from Naughty Bear and is leader of the Aliens.
Xoon invaded Perfection Island after Sunbeam contacted the Aliens. His minions mind controlled all of the bears, starting with Sunbeam. His alien army was later defeated though by Naughty and he left Perfection Island.
Xoon returns to Perfection Island and wants revenge on Naughty after stopping his invasion. His aliens and the Bears are starting a war between eachother, and Naughty wanted to stop Xoon once and for all. Naughty managed to kill Xoon for opposing him.