The nWo (New World Order). This group became one of the most powerful stables in not just WCW history, but pro wrestling history since the Four Horseman.
This group also revitalized the dying career of Hulk Hogan, by leading one of the most infamous heel turns in wrestling history.
At Bash at the Beach '96, the main event involved The Outsiders and their mystery partner against Randy Savage, Sting, and Lex Luger.
The Outsiders would then come down to the ring without their mystery partner and proclaim that they were capable of finishing the match themselves.
As both parties went back and fourth, the team of Sting, Lex Luger, and the "Macho Man" Randy Savage proved to be too much for them, as Kevin Nash and Scott Hall started dominating the match.
Hulk Hogan would then make his way down the ring, seeming to come to the aid of Sting and Savage, but he performed one of the most awe-inspiring swerves in wrestling history.
He hit several Atomic Leg Drops on Randy Savage, and threw the ref out the ring, effectively ending the match as a no-contest.
The audience began to be so wracked with anger and frustration that they began to throw trash in the ring, (and according to Gene Okerlund) break Hulk Hogan's nose after he was hit with a soda can.
As Okerlund entered the ring and questioned the actions of Hogan, Hogan proclaimed that he was tired of WCW and tired of the fans that have turned on him, despite what all at he'd done for them.
Hogan have claimed that the three of them, (Hall, Nash, and Hogan of course) are the "new world order of wrestling" and then declared their intentions of taking over WCW.
This faction would also began to attack various WCW wrestlers, committing acts of vandalism and assault.
The stable soon began their rise to power with the newly rechristened Hollywood Hogan capturing the WCW World Title, and spraypainting the words nWo on it.
They would also began to trick fans with their own version of Sting, causing Sting to leave WCW for over a year and become the "Crow" character.
These events would later lead up to the horrible finish of Starrcade '97, which should have ended the nWo once and for all.
But you know what? It didn't. The nWo never really had a proper ending, effectively overkilling the once elite faction and coming up with 921 nWo reunions.
Although the nWo never ended the way it should have and didn't pave way for the young and upcoming talent until 2000, it cannot be argued the the nWo is one of the greatest stables of all time.