WWE Cruiserweight Championship (1991–2007)
In March 2001, World Wrestling Federation Entertainment, Inc. purchased World Championship Wrestling. Following this, the "Invasion" storyline happened, in which WCW was "destroyed". During the "Invasion", only four WCW championship titles remained active, including the WCW Cruiserweight title. On July 30, the WCW Cruiserweight Championship and the WWF Light Heavyweight Championship were up for grabs in what was billed as a unification match when the WWF Light Heavyweight Champion, X-Pac, beat the WCW Cruiserweight Champion, Billy Kidman.  However, the titles were still defended separately after that. After the end of the "Invasion" at Survivor Series 2001, the WCW Cruiserweight Championship remained active and was renamed the World Wrestling Federation (WWF) Cruiserweight Championship, while the Light Heavyweight Title was retired.