Shao Kahn resurrects Shang Tsung and entrusts him the sphere controlling elements of the nature (fire, wind, water and earth).
Shang Tsung is the most suitable person to possess the sphere,
because the more malicious the master is, the stronger becomes the magic of sphere.
The old enemy of good organizes different natural disasters and weakens Raiden.
Warriors of Earth being entrapped, nobody can help the God of Thunder.
Thus, he is the one who has to decide the fate of the world.
But the good, even thought it grew weak, becomes stronger than the evil, strengthened with forces of magic.
Having defeated Shang Tsung, Raiden sends the sphere to Netherealm.