Emperor Shao Kahn's lust for power is matched only by his ruthlessness. Millenia ago, he overthrew Onaga as ruler of Outworld and has conquered many other realms since. Eventually he turned his attention to Earthrealm. The Mortal Kombat tournament prevents him from taking the realm by force, but if Shao Kahn's champions win 10 consecutive tournaments, Earthrealm will be his. As long as his champions Shang Tsung and Prince Goro do not fail him, he will be victorious."
Shao Kahn was defeated by Sephiroth in the opening round.
Kahn tied with Mario in the opening round, sending them both to the alternates pool. When King (Tekken) and Liu Kang tied, Kahn was sent in to the third round to replace them, where he defeated Wolverine (Ironically, Wolverine had defeated the Kahn/Mario replacement, Ellis, in Round 2). Though Kahn is usually successful against Thunder Gods, he could not defeat Thor in the fourth round of this tournament.