Gamecube - Mortal Kombat: Deadly Alliance

At the end of Mortal Kombat 4 (which is Scorpion's canon ending), Quan Chi revealed himself to be the murderer of Scorpion's family and clan, before attempting to send him back to the Netherrealm. Scorpion, fueled with homicidal rage, grabbed Quan Chi at the last minute, taking the sorcerer with him. In the opening intro to Deadly Alliance, it is revealed that Quan Chi was able to escape the Netherrealm, using the amulet he had stolen from Shinnok. He appears in a tomb containing several mummified remains and an ancient runestone, which reveals that the remains are the "undefeatable" army of the long-forgotten ruler of Outworld, known simply as the "Dragon King". Learning that it can be revived, Quan Chi forms an alliance with Shang Tsung, offering him an endless supply of souls in return for him transplanting the souls of defeated warriors into the army. The two work together to defeat, and kill, Shao Kahn and Liu Kang, the two greatest threats to their plans. Unable to interfere as an Elder God, Raiden surrenders his status after realizing that, should the alliance be victorious, Earthrealm is doomed.