The Rock returned in late July 2001 when the WWF was feuding with rival promotions World Championship Wrestling (WCW) and Extreme Championship Wrestling (ECW) during what's known as The Invasion storyline. In reality, WCW was purchased by Vince McMahon and the WWF, and ECW had gone out of business in early 2001. Many former WCW and ECW wrestlers were then brought onto WWF television and formed The Alliance to compete with WWF in storyline. The Alliance and Vince McMahon then both attempted to persuade the Rock to join their team. The Rock then aligned with McMahon and the WWF. The next month, the Rock defeated Booker T, at SummerSlam, to win the WCW Championship for the first time. He later lost the title to Chris Jericho at No Mercy. The next night on "Raw", he teamed with Jericho to win the WWF Tag Team Championship from The Dudley Boyz. The two then lost the tag titles to Booker T and Test on the November 1, 2001 episode of "SmackDown!". The Rock defeated Jericho on the November 5 episode of "Raw" for his second WCW Championship.