The character originally began as something of an in-joke during Mortal Kombat II. It was an Easter egg for fans to try to discover. If you won 50 fights in a row, the mysterious opponent took you on. No name was officially given at the time, but soon as these things tend to do, it somehow became public knowledge that the character was named Noob Saibot, which is the names of the game’s two primary creators spelled backwards–Ed Boon and John Tobias.
As the Mortal Kombat series evolved and its mythology expanded, so too did Noob Saibot, and a history was created for him. After the events of the first Mortal Kombat game, Scorpion avenges his own death by killing Sub-Zero (who was then replaced by his brother). Not content to stay dead, Sub-Zero then becomes a wraith, and Noob Saibot was born. There was also something about him reprogramming the robot Smoke, trying to create cyber-warriors, and a bunch of other stuff that will be wiped away when the reboot strikes.
Check out the video of Noob Saibot in action, and look for Mortal Kombat on the PS3 and Xbox 360 on April 19.
[Warning: Trailer may not be suitable for all ages]