Is Sub Zero Scorpion’s brother?

Is Sub Zero Scorpion’s brother? The two are not brothers, but the two versions of Sub-Zero were. Scorpion killed one of those Sub-Zeroes and — in accordance with some kind of ninja code — promised he would protect the second Sub-Zero rather than kill him, too.

The two are not brothers, but the two versions of Sub-Zero were. Scorpion killed one of those Sub-Zeroes and — in accordance with some kind of ninja code — promised he would protect the second Sub-Zero rather than kill him, too.