Noob Saibot emerges from the darkest region of reality, a region known as the Netherealm. He belongs to a group called the Brothers of the Shadow, and worships and evil and mysterious fallen elder god. His mission is to spy the events taking place in the battle between the realms and report back to his enigmatic leaders. First a passive observer, Noob Saibot would soon receive orders to side with the evil emperor Shao Kahn.
Shinnok wanted him to join Kahn's battle during his Earthrealm invasion to gain his thrust and to gain entrance into the Earth realm. When Kahn drops his guard Noob Saibot is ordered to attack. If Noob Saibot would have succeeded, Shinnok, the fallen elder god would have been able to gain the power he needs to strike back at the elder gods who banished him into the Netherealm.