To bad they messed the sub-zero story in the early days, i'm pretty sure they are pissed on themselves by replacing the original Sub-Zero with his younger brother in MKII, now they have problems among the fans because of this mistake of them creating two characters with the same name and with different stories...
Makes things a hell lot more complicated... I wished they just made one sub-zero and let his brother out of the story, subby just turned good in MKII, too bad they are stuck with this storyline and they can't change it anymore.
Sub-zero was my favorite character in MK1, but after the double-brother-thing many other characters replaced him.