New World Order (nWo)

After the WWF bought WCW in 2001, Vince McMahon brought back Hulk Hogan, Kevin Nash, and Scott Hall as the nWo, at the No Way Out 2002 pay-per-view on February 17, 2002. In this storyline, the nWo was brought in as McMahon's allies in an attempt to "kill" the WWF so that McMahon would not have to share power with new WWF co-owner Ric Flair. However, Hulk Hogan left the group after he lost his WrestleMania X8 match with The Rock and was assaulted by Hall & Nash. Over time, more members joined the nWo such as X-Pac (formerly known as Syxx in WCW), Big Show (formerly known as The Giant in WCW), Booker T, Shawn Michaels and Ric Flair & Goldust as semi-members.
The nWo reunion in the WWF was short-lived. Abruptly on July 15, 2002, Vince McMahon, having regained full control of WWE from Ric Flair, disbanded the nWo.