Uhm...I didn't know Sub-Zero had a sister...?

Yes. In Mythologies they said Sub-Zero's parents had three kids; two sons and a daughter. They were taken by the Lin Kuei; the sons were trained and the mother and daughter were never seen again.

I believe Frost is the lost sister and I think she'll be back. If Frost isn't the sister, then I doubt they'll bother bringing back the real one...since she'd just be another Frost.

They won't introduce us to Sub-Zero's sister. We have Frost instead.

But I thought Scorpion was related to Sub-Zero? I know Noob is but how is Scorpion with Sub-Zero. It can't just be the fucking Scorpion wife/son thing?

Scorpion's not related to Sub-Zero.

Ah. That would be cool if Frost was indeed Sub's lost sister. Like Crow said in IRC, she could team up with Noob or something or scrap the sister thing and have Sub and Frost have feelings for each other or something.