Siro, who had hunted down the three assassins and watched Sub-Zero's power came back, warned Kung Lao, but it was too late as Sub-Zero appeared and attacked them with ice.
Three more Lin Kuei assassins attacked Kung Lao and his friends, but were also defeated and retreated back to the Lin Kuei temple, where their master had Sub-Zero freeze them to death for his failure before going himself to steal the crystal.
The master then assured Shang that his best warrior, Sub-Zero will succeed, but told him to have patience because he is still a 'new-born' and hadn't still perfected his powers. The grand-master sent one of his best assassins but he failed, thus making Shang Tsung angry and forcing him to appear before the grand-master and almost kill him. His grand-master was hired by Shang Tsung to eliminate Kung Lao and steal a magic crystal that had the ability to transport it's keeper to other dimensions. He soon became their most promising and skilled fighter, being able to manipulate the ice.
He was forcibly taken at a young age by the Lin Kuei from his family, and was raised and trained by them to become an assassin. Sub-Zero is the long ancestor of both Bi-Han and his younger brother Kuai Liang and the arch-nemesis of Takeda.
