Jade Nationality:Edenia
First Appearance: Mortal Kombat II (1993)
Alignment: Good
Allies: Kitana, Sindel
Foes: Tanya, Mileena

History:
Longtime ally of the Edenian crown, Jade witnessed the arrival of the Dragon King and raced to Edenia to inform her queen of Kitana's fate. She arrived too late, however, for Tanya had already imprisoned Queen Sindel and gave the Dragon King access to that realm. She freed Sindel and the two escaped to Outworld.

Scorpion
Origin: Earthrealm
First Appearance: Mortal Kombat (1992)
Alignment: Neutral
Allies: None
Foes: Quan Chi, Drahmin, Moloch, Sub-Zero

History:
In his haste to confront his nemesis, Quan Chi, he was ambushed by two Oni and cast into a powerful soulnado. He would surely have been torn apart by the souls trapped there had he not managed to escape into the Void. It was in this place that he first set eyes on the fabled Elder Gods. He would be forever changed by this encounter.

Sub-Zero
Origin: Earthrealm
First Appearance: Mortal Kombat (1992)
Alignment: Good
Allies: Smoke, Frost, Raiden
Foes: Quan Chi, Hotaru, Scorpion

History:
While still in Outworld, the Lin Kuei Grand Master, Sub-Zero, discovers his true heritage -- the source of his mastery over cold. This discovery will aid him in the fight against the Dragon King's Tarkatan hordes.

Yeah, that came from the IGN article:

http://xbox.ign.com/articles/535/535726p1.html