Cyrax is unit LK-4D4. The 2nd of of three prototype cybernetic ninjas built by the Lin Kuei. Like his counterparts his last programmed command is to find and terminate the rogue ninja, Sub-Zero. Without a soul, Cyrax goes undetected by Shao Kahn and remains a possible threat against his occupation of Earth.
Cyrax is captured by Sub-Zero and reprogrammed with new orders: destroy Shao Kahn. With Kahn unable to detect the assassin's soulless presence, Cyrax delivers a successful sneak attack. But, after eliminating Kahn and saving Earth Cyrax awaits new orders from his Lin Kuei headquarters. The orders never come and Cyrax malfunctions. He ends up stranded in the middle of a vast desert, blindly heading towards his base.